Sen. Elizabeth Warren is demanding answers to economic questions surrounding the Iran war, ticking off a list of queries about the impact on food, energy and retail costs, among other concerns, in a letter sent Friday to administration officials.

The liberal Democratic firebrand from Massachusetts ripped President Donald Trump, whom she said has “dragged the United States into an illegal and reckless war” that will hurt U.S. consumers, particularly in the middle and lower classes.

“I write today with grave concern that President Trump is weakening an already fragile economy, and will continue to do so, pouring billions of dollars into a war that will drive up prices, slow growth, and leave American families with higher costs while they are forced to foot the bill,” Warren said, according to a letter exclusively obtained by CNBC.

Warren is the ranking member on the Senate Banking, Housing and Urban Affairs Committee.

Since the war began three weeks ago, energy costs have soared. The benchmark global oil price is approaching $110 a barrel, with costs at the pump nearing $4 a gallon, or about $1 higher than a month ago, according to AAA.

Official government inflation figures are not available yet for March, but surging energy costs — and pass-through effects — are likely to boost prices at least as long as the fighting continues.

Warren delineated impacts on energy, food and retail prices, and said the war is having a broader impact in terms of economic uncertainty.

“The list of economic consequences goes on and on,” she wrote. “And it does not appear that the Trump Administration has any meaningful plan to keep prices low or prevent Americans from running low on the goods they need to work, go to school, and feed their families.”

Administration officials did not immediately respond to a request for comment.

The letter was addressed specifically to Treasury Secretary Scott Bessent, National Economic Council Director Kevin Hassett, and Pierre Yared, the acting chair of the Council of Economic Advisers.

Warren quizzed the recipients on whether their organizations had done costs analyses on the war’s impact prior to its start or had projections on where they see prices going for the rest of 2026.

Earlier in the week, Federal Reserve Chair Jerome Powell did not directly address the war but said he expected energy prices would rise but wasn’t sure of the longer-term impacts. The Fed voted to hold its benchmark rate steady, in part citing uncertainty over the war.

Supply measures alone won’t be enough to mitigate “the largest supply disruption in the history of the global oil market” amid an escalating conflict in the Middle East, the International Energy Agency warned on Friday.

Instead of waiting for disrupted production to recover, lowering demand could ease pressure on consumers and help bring prices down more quickly.

Minimizing road and air transport, working from home where possible, and switching to electric cooking could significantly help cushion the shock for consumers, the agency said.

Heightened geopolitical risk has rattled traders, sending not only crude prices higher but also sharply increasing costs for refined products such as diesel and jet fuel, which directly impact transportation, logistics and consumer prices.

Oil prices have surged more than 40% since the start of the U.S.-Iran war on Feb. 28, reaching their highest levels since 2022 as supply has been severely disrupted, mostly due to the effective closure of the Strait of Hormuz. 

The strait is a narrow maritime corridor off Iran’s coast that connects the Persian Gulf and the Gulf of Oman and normally carries about a fifth of global oil consumption. 

Countries have already begun tapping strategic petroleum reserves, with hundreds of millions of barrels slated for release. 

The IEA last week agreed to release 400 million barrels of oil to address the supply disruption triggered by the Iran war — the largest such action in the organization’s history — without providing a timeline for when the stocks would enter the market. 

“Addressing demand is a critical and immediate tool to reduce pressure [on] consumers by improving affordability and supporting energy security,” the IAE said Friday, as it laid out a range of measures that can be taken by households and businesses to lower demand.

Among the most impactful steps are encouraging remote work where possible, increasing carpooling and public transit use, and cutting back on non-essential air travel.

Measures focus primarily on road transport, which accounts for around 45% of global oil demand.

Working from home where possible reduces fuel demand for commuting, while lowering speed limits, shifting from private cars to public transport, and alternating private vehicle access in cities, could further reduce congestion and fuel consumption, the agency said. 

Measures to shift liquefied petroleum gas (LPG) use away from transport and towards essential applications like cooking can also help keep prices lower, as can adopting alternative clean cooking solutions that reduce reliance on LPG.

Countries are also looking to fiscal measures to ease the pressure on consumers and prevent sharp rises in fuel prices that could add to inflationary pressures.

Spain is planning to reduce the value-added-tax (VAT) on fuel to 10% from 21%, according to a local media report citing sources familiar with the matter. The government will also eliminate a 5% tax on electricity, according to the report. 

Italy on Wednesday cut excise duties on fuel, while Germany’s finance ministry has said it is looking at ways to shield consumers from rising fuel prices, such as introducing a windfall tax on oil companies. 

Early Friday, international Brent crude futures with May delivery rose 1.3% to $109.93 per barrel, while U.S. West Texas Intermediate futures with April delivery traded largely flat at $96.20.

— CNBC’s Sam Meredith contributed to this report

U.S. President Donald Trump on Wednesday warned that if Iran continued targeting Qatar’s energy facilities, America would “massively blow up the entirety of the South Pars Gas Field.”

Tehran has attacked a key energy facility in Qatar after Israel bombed the South Pars Gas in Iran, signaling a sharp escalation in the conflict and sending energy prices soaring.

Qatar said Wednesday that Iranian missiles caused “extensive damage” at Ras Laffan Industrial City, home to the largest liquefied natural gas, or LNG, export facility in the world.

Trump also denied any prior knowledge of Israel attacking South Pars, pushing back against reports that the strike was coordinated with and approved by his administration.

In a social media post Wednesday night stateside, Trump said that “the United States knew nothing about this particular attack, and the country of Qatar was in no way, shape, or form, involved with it, nor did it have any idea that it was going to happen.”

Trump also urged Israel to end attacks on the South Pars gas field, unless Iran “unwisely” decides to attack Qatar. In that case, the U.S. will “massively blow up the entirety of the South Pars Gas Field at an amount of strength and power that Iran has never seen or witnessed before.”

The attack on South Pars — the world’s largest natural gas reserve, shared between Iran and Qatar — marked the first time Israel has targeted Iranian natural gas production infrastructure since the conflict began on Feb. 28.

Iran has fired ballistic missiles at Qatar’s Ras Laffan Industrial City, with ​QatarEnergy saying the attack had caused “extensive damage” warranting deployment of emergency response teams to contain fires at the site. No casualties were reported.

Separately, Reuters reported Thursday that the U.S. government was considering deploying thousands of U.S. forces to the Middle East, raising the prospect of further escalation.

As tensions spiral, world leaders are scrambling to contain the Middle East conflict amid fears of deepening the turmoil in global energy markets.

German Foreign Minister Johann Wadephul on Wednesday warned of a “crisis of the gravest order” if global supply chains continued to be disrupted, calling for a path toward de-escalation and a cessation of hostilities once U.S. and Israeli military objectives are achieved, according to local media reports.

The United Arab Emirates called the targeting of energy facilities linked to the South Pars field in Iran a “serious escalation,” posing “a direct threat to global energy security” with severe environmental repercussions.

The UAE Ministry of Foreign Affairs also called Iran’s targeting of its Habshan gas facility and Bab field a “terrorist attack,” risking a “dangerous escalation.”

Qatar’s foreign ministry spokesperson Majed al-Ansari described the Israeli strike on South Pars as “a dangerous and irresponsible step” amid escalating regional tensions.

The Gulf nation has declared Iranian military and security attachés and their staff at the Iranian embassy in Doha “persona non grata,” ordering them to leave the country within 24 hours.

Saudi Arabia’s Foreign Minister Prince Faisal bin Farhan Al Saud also appeared to toughen the tone, reportedly saying that “what little trust there was before with Iran has completely been shattered.” Both political and non-political responses to Iran remain on the table, he added.

Iran’s Islamic Revolutionary Guard Corps on Wednesday threatened to escalate hostilities by targeting oil and gas facilities in Saudi Arabia, the UAE, and Qatar.

In a post on X, Iran’s President Masoud Pezeshkian condemned the strikes on Iran’s energy infrastructure, saying that they “could have uncontrollable consequences, the scope of which could engulf the entire world.”

The attacks on Middle East energy production facilities have further deepened supply disruption triggered by the conflict. Brent crude May futures rose 4% to $111.77 a barrel as of 10:25 p.m. ET , while U.S. West Texas Intermediate futures for April climbed over 1.3% to $97.56 per barrel.

Oil tanker traffic through the Strait of Hormuz — a vital chokepoint for one-fifth of global oil supply and a significant share of LNG exports — has plunged since the war began, with the waterway effectively closed to most commercial shipping.

Hello, this is Leonie Kidd writing to you from London. Welcome to another edition of CNBC’s Daily Open.

U.S. President Donald Trump continues to dominate the news cycle, and his latest round with reporters in the Oval Office has yielded more headlines and market moves this morning. It’s only Tuesday and already it’s been a volatile week for oil, which remains the epicenter of trading action.

Market participants — as well as us journalists — will need to stay on their toes to keep up with developments.

Oil prices jumped over 2% on Tuesday as uncertainty lingered over a U.S.-led coalition to protect shipping through the Strait of Hormuz. President Donald Trump suggested Monday that the coalition was not fully in place as he urged other countries to get involved.

Energy analysts and traders said Monday that they wouldn’t be surprised if oil prices climb to as high as $200 per barrel as the sprawling Middle East crisis drags on.

U.S. President Donald Trump said his planned trip to China later this month could be delayed as Washington sought to pressure Beijing to help reopen the Strait of Hormuz, underscoring a renewed flashpoint in an already fragile bilateral relationship.

In an interview with the Financial Times on Sunday, Trump said he expected China to help unblock the strait before he travels to Beijing for a summit with Chinese leader Xi Jinping, which had been scheduled for March 31 to April 2.

Trump added that the two weeks to the meeting were a “long time” and that Washington wanted clarity before then. “We may delay,” Trump told the FT, without elaborating on timing.

The remarks came as Treasury Secretary Scott Bessent met his Chinese counterpart He Lifeng in Paris for talks about the planned summit. Beijing has yet to confirm the dates and typically announces such plans closer to their scheduled start.

The visit would be the first for a U.S. president since Trump’s last trip during his first term in 2017. It also comes five months after the two leaders met in the South Korean city of Busan, where they agreed to a one-year truce in a trade war that had seen tit-for-tat tariffs briefly soar to triple-digit levels last year.

Chinese top diplomat Wang Yi said earlier this month that the agenda for the exchange was already “on the table.”

Trump said Sunday aboard Air Force One that China sourced about 90% of its oil through the strait, framing Beijing’s cooperation on Hormuz as a matter of self-interest. The president has appealed to several European and Asian countries, including China, to help open up the chokepoint through which roughly one-fifth of the world’s daily oil supply passes.

However, the numbers suggest Beijing may be more insulated from the closure than Trump’s comments implied.

China has spent the past two decades diversifying its energy sources and building strategic reserves to cushion the blow of any prolonged disruption.

Seaborne oil imports through the strait now account for less than half of China’s total oil shipments, according to Rush Doshi, director of the China Strategy Initiative at the Council on Foreign Relations. Nomura also estimated that oil flows through Hormuz represent just 6.6% of China’s total energy consumption.

Satellite imagery tracked by maritime research firms showed that Iran has continued to ship large amounts of crude oil to China since the war broke out late last month.

Both sides appeared to increase pressure ahead of the high-stakes summit in Beijing. The U.S. launched trade investigations into a broad swath of countries over alleged excess capacity and failures to address forced labour.

In a statement Monday, China’s commerce ministry said the Trump administration had “once again abused the Section 301 investigation process to override domestic law over international rules,” calling the probes “extremely unilateral, arbitrary and discriminatory.”

Beijing said it had formally lodged representations with Washington against the investigations. “We urge the U.S. side to immediately correct its wrong practices and meet China halfway,” a ministry spokesperson said, calling for dialogue and negotiated solutions.

The ministry said it would monitor the progress of the investigations closely and take unspecified measures to defend China’s interests.

— CNBC’s Evelyn Cheng contributed to this report.

Countries around the world have scrambled to cope with the fallout of the energy shock from the Iran war, imposing measures from fuel export bans, loosening refining standards, and even getting workers to climb stairs instead of taking elevators.

This comes as the Iran war stretches into its third week, and despite U.S. President Donald Trump proclaiming that the U.S. has “won,” the effects of the war, especially on the energy market, continue to be felt.

On Thursday, China ordered refiners to stop refined fuel exports so as to mitigate potential domestic fuel shortages, according to Reuters.

Sources told the agency that the ban was issued by the National Development and Reform Commission, and includes shipments of gasoline, diesel and aviation fuel.

CNBC attempted to reach the NDRC for comment, but did not receive an immediate reply.

Other major countries are considering or have imposed price caps for fuel products.

On Monday, Japanese Prime Minister Sanae Takaichi said that Tokyo was considering steps ‌to cushion the economic blow from rising fuel costs, including curbing gasoline prices.

Takaichi was quoted by Japanese media on Thursday as saying she plans to cap pump prices at an average of 170 yen ($1.07) per liter nationwide, adding that gasoline prices could potentially hit 200 yen per liter.

Tokyo also conducted a unilateral release of crude from its own stockpiles, without waiting for coordination with other nations.

Japan has been particularly badly hit by the war in Iran, as the world’s third-largest economy needs to import almost all of its energy needs.

South Korean President Lee Jae Myung said on Friday the government implemented a petroleum price ceiling.

“We have decided to set a clear price cap on supply prices to curb domestic fuel prices, which are fluctuating wildly due to the unstable international situation,” Lee said.

India also had to make some tough choices. The country told oil refineries to prioritize supplying liquified petroleum gas to the 330 million households that use it as a primary cooking fuel, over 3 million businesses that use commercial LPG cylinders.

Work-from-home orders came back in some countries after years of companies trying to coax workers back to offices after the pandemic, with Vietnam and Thailand reportedly getting employees to work remotely.

Thailand went a step further, ordering civil servants to take the stairs instead of elevators, reducing their reliance on air conditioning and telling government employees to wear short-sleeved shirts rather than suits.

The Philippines and Pakistan both instituted four-day work weeks for government workers, and Bangladesh has even shifted its calendar, bringing forward its Eid-al-fitr holiday, allowing universities to close early in a bid to save fuel.

Tehran on Sunday vowed to kill Israeli Prime Minister Benjamin Netanyahu as the U.S.-Israel war on Iran continued to threaten oil supplies in the Gulf.

“IRGC vows to pursue and kill ‘child-killer’ Netanyahu if he is still alive,” Iran’s IRNA news agency said in a post on X, referring to the country’s Islamic Revolutionary Guard Corps.

Israel in return targeted key members of Iran’s leadership over the weekend.

The Israel Defense Forces said they had “eliminated” two senior Iranian intelligence officials of the “Khatam al-Anbiya” Emergency Command.

Late on Saturday, the IDF said in a post on X that it had struck the primary research center of the Iranian Space Agency and an aerial defense system production factory.

Iran continued to retaliate against targets around the region. Israeli emergency services reported a “recent missile barrage” fired at central Israel, but said there were no known injuries.

Meanwhile, oil-loading operations in the United Arab Emirates’ port of Fujairah resumed on Sunday according to media reports, after being interrupted a day earlier due to a fire caused by falling debris from an intercepted drone.

A spokesperson for Abu Dhabi’s state oil giant, ADNOC, which operates in Fujairah, directed CNBC to the Fujairah Media Office, which did not immediately respond to emailed requests for comment.

The ongoing war has effectively choked off energy supplies moving through the narrow Strait of Hormuz which separates Iran and the UAE.

On Friday, Brent crude oil futures closed above $100 per barrel for the second straight day, and the global oil benchmark has surged more than 40% since the war in Iran began.

U.S. President Donald Trump said on Friday that he directed the U.S. Central Command to carry out a bombing raid, hitting military targets on Iran’s Kharg Island for the first time. Trump threatened further strikes on Iran’s oil export hub, even as he repeatedly urged allies to deploy warships to help the U.S. secure the Strait of Hormuz.

Kharg Island has been thrust into the global spotlight because it is regarded as one of Iran’s most sensitive economic targets. The terminal accounts for around 90% of the country’s crude exports and has a loading capacity of roughly 7 million barrels per day.

Iran’s Foreign Minister Abbas Araghchi took to social media to say his country is “ready to form a committee with the countries of the region to investigate the targets that were attacked. Our attacks only target American bases and interests in the region.”

In a Telegram post Sunday, Araghchi said: “We have not targeted any civilian or residential areas in the countries of the region so far,” and added, “Occupying Kharg Island would be a bigger mistake than attacking it.”

The impact of the war is now also affecting major events in the Gulf region. Formula 1 said it has canceled the upcoming Grand Prix races in Bahrain and Saudi Arabia scheduled for April.

“While alternatives were considered, no substitutions will be made in April,” Formula 1 said in a post on X.

The prospect of a U.S. move to seize Kharg Island, a strategically vital hub often referred to as Iran’s “oil lifeline,” is considered extremely high risk, both from a geopolitical and economic standpoint.

The five-mile-long coral island, which is located about 15 miles off the coast of mainland Iran in the waters of the northern Persian Gulf, has been left untouched through nearly two weeks of U.S. and Israeli-led strikes against Iran.

The Trump administration has discussed seizing the island, according to an Axios report on March 7, citing four unnamed sources with knowledge of the discussions.

White House officials have previously said they expect oil prices to fall dramatically once Operation Epic Fury comes to an end, while White House Press Secretary Karoline Leavitt has said the president “wisely” keeps all options on the table.

Kharg Island has been thrust into the global spotlight because it is regarded as one of Iran’s most sensitive economic targets. The terminal accounts for around 90% of the country’s crude exports and has a loading capacity of roughly 7 million barrels per day.

Analysts say that any attempt to attack or seize it would require a ground troop operation, which the U.S. appears reluctant to undertake. An attack would also likely prompt a sustained increase to already soaring oil prices.

U.S. Defense Secretary Pete Hegseth has previously refused to rule out deploying American ground forces in Iran but said the U.S. won’t get bogged down in the country.

Francis Galgano, an associate professor and military geography and environmental security specialist at Villanova University in Pennsylvania, said the location of Kharg Island is important because it sits in deep water that enables the approach of oil supertankers.

“I will put on my war hat … if the objective is to win the war (quickly), you destroy or capture Kharg immediately,” Galgano told CNBC by email, adding that any such attempt would create maximum leverage over Tehran.

Nonetheless, taking the small island would be no mean feat, Galgano said. “It would involve moving a considerable number of ground combat troops into the region … I estimate about 5,000 to take and hold the island.”

He added: “All of this of course affects global oil markets, but they are already being affected.”

Oil prices have been extremely volatile since the U.S. and Israel launched airstrikes on Iran on Feb. 28. Iran has retaliated by targeting ships trying to pass through the Strait of Hormuz, with several incidents reported in recent days.

The narrow waterway is a key maritime corridor that connects the Persian Gulf and the Gulf of Oman. Roughly 20% of global oil and gas typically passes through it.

International benchmark Brent crude futures with May delivery traded off by 1% at $99.45 per barrel on Friday, while U.S. West Texas Intermediate futures with April delivery were last seen 2% lower at $93.81.

If Kharg Island were disabled, analysts at JPMorgan said the loss of Iran’s storage buffer and the scarcity of viable export alternatives would “rapidly trigger upstream shut-ins across major southwest fields.”

“With production near 3.3 mbd and exports around 1.5 mbd, as much as half of national output could be at risk if the hub remains offline, and the previously assumed 20‑day buffer would vanish from day one,” they said in a note published Sunday.

Iran’s enormous scale and mountainous topography mean the U.S. mobilizing any conventional ground forces in the region would require hundreds of thousands of troops, according to Alex Plitsas, a senior non-resident fellow at the Atlantic Council think tank.

“Any use of ground forces would likely be limited to special operations forces for specific missions,” Plitsas said Wednesday in a note, without referring specifically to Iran’s Kharg Island.

— CNBC’s Michael Bloom contributed to this report.

Defense Secretary Pete Hegseth on Friday brushed aside concerns that the effective closure of the Strait of Hormuz because of the Iran war, which has spiked oil prices, would continue being a problem for the U.S. and the world for much longer.

Iran has been “exercising sheer desperation in the Straits of Hormuz,” Hegseth said at a Pentagon press briefing.

“We have been dealing with it, and don’t need to worry about it,” he said.

The trading price of West Texas Intermediate crude oil on Friday morning was around $93 per barrel. A day before the war began on Feb. 28, a barrel of WTI was selling for about $67.

Hegseth criticized media reports that claimed that before attacking Iran, the United States military lacked a plan to reopen the Strait of Hormuz, which is the world’s most critical oil shipping chokepoint.

“Of course, for decades, Iran has threatened shipping in the Strait of Hormuz. This is always what they do, hold the strait hostage,” he said.

“We planned for it. We recognize it,” Hegseth told a reporter who asked him why the Pentagon had not planned for the strait being choked off to traffic.

“Ultimately, we want to do it sequentially in the way that makes the most sense for what we want to achieve.”

Neither Hegseth nor Joint Chiefs of Staff Chairman Dan Caine said how the U.S. would open up the strait to the traffic of oil tankers and other ships.

On Thursday morning, Energy Secretary Chris Wright told CNBC that the U.S. Navy is not ready to escort oil tankers through the strait. Treasury Secretary Scott Bessent, hours later, told Sky News that the U.S. Navy, and possibly an international coalition, would begin escorting ships through the strait as soon as “militarily possible.”

Asked how soon the Strait of Hormuz would be open to traffic, Hegseth said Friday, “The only thing prohibiting transit in the straits right now is Iran shooting at shipping.”

“We have a plan for every option here,” he said. “We’re working with our interagency partners. That’s not a strait we’re going to allow to remain contested or a lack of flow of international goods.”

Caine, when asked about removing mines from the Strait of Hormuz laid by Iran, said, “We retain a range of options to solve a whole variety of problems.”

Hegseth predicted, again, that “soon and very soon, all of Iran’s defense companies will be destroyed.” He said that as of two days ago, every company that builds components of Iran’s ballistic missiles “has been functionally defeated.”

The Defense secretary speculated that Iran’s “new so-called, not-so-supreme leader,” Mojtaba Khamenei, “is wounded and likely disfigured.”

“He put out a statement yesterday, a weak one, actually, but there was no voice and there was no video,” Hegseth said.

Hegseth and Caine’s vagueness in offering either details of a possible solution to the strait’s closure, or a timeline for such a solution came as RBC Capital Markets, in a note on Friday, said, “There is significant skepticism that a robust US Navy tanker escort service will be operational soon due to capacity constraints as well as the fact that Iran’s enhanced military capabilities will pose a bigger challenge than the US faced during the Tanker Wars of the 1980s.”

The note also said that a $20 billion insurance promoted by the U.S. International Development Finance Corp., to encourage oil tankers and other commercial vessels to begin ffic to begin transiting the straight “similarly … is not generating much enthusiasm as it only covers the roughly 22 miles of sea lanes in the Strait, not the surrounding waterways, and offers neither casualty nor environmental coverage.”

“Above all, we are struck by the fact that a number of Washington-based security analysts seem to be working with longer-duration timelines than market participants residing outside the Beltway,” RBS’s Helima Croft, head of global commodity strategy and MENA research, wrote.