WASHINGTON (AP) — President Donald Trump said Monday he will move to suspend the federal tax on gasoline to help Americans shoulder surging fuel prices caused by the Iran war.

The president cannot suspend the federal tax on his own. Congress would have to approve the move.

Lawmakers from both parties have pushed for a gas-tax suspension, saying it would provide much-needed relief for families and businesses that rely on their cars and trucks to get to work and school and run everyday errands.

As of Monday, the average national gas price was $4.52 a gallon, according to the AAA motor club, 50% higher than the average price of just under $3 a gallon before Trump began the war against Iran.

What the gas tax supports

The federal tax is currently set at 18.4 cents per gallon on gasoline and 24.4 cents per gallon on diesel fuel, an amount that does not include state taxes, which often are higher. The tax provides more than $23 billion per year in revenue for federal highway and public transit programs.

Asked by reporters at the White House how long the tax should be suspended, Trump said, “Until it’s appropriate.” While the tax is only a small percentage of the price of gas, “it’s still money,” Trump said.

As gas prices have spiked, the Trump administration has released millions of barrels of oil from the U.S. Strategic Petroleum Reserve and temporarily lifted sanctions on some Russian and Iranian oil shipments already at sea. The U.S. is negotiating with countries reliant on Middle East crude to join a coalition to police the Strait of Hormuz, where about one-fifth of the world’s traded oil normally flows.

Trump needs Congress — and they’re beginning to react

Republican Sen. Josh Hawley of Missouri said on social media Monday that he will introduce legislation to suspend the gas tax. Democrats have previously sponsored similar legislation. Rep. Anna Paulina Luna, R-Fla., also said in a post on X that she will introduce a bill “to suspend the federal gas tax in light of Trump’s recent remarks.”

Senate Majority Leader John Thune said Monday he has not “been a fan” of a gas tax suspension, but added: “You know, I’ve got some colleagues out there who think it’s a good idea. So, we’ll hear them out.”

Thune, a Republican from South Dakota, said he’d prefer to reopen the Strait of Hormuz to “normalize gas prices” without legislation. “Obviously, any time you suspend the gas tax, that leaves a big hole in the highway trust fund, which also has implications down the road,” he said.

The ongoing spike in gas prices has set off alarms among some Republicans that it could hurt the party’s chances in the midterm elections. Trump has previously said higher fuel prices are worth paying to prevent Iran from getting a nuclear weapon.

That hardline message appeared to soften Sunday as Energy Secretary Chris Wright said the Trump administration was “open to all ideas,” including a suspension of the gas tax, during an interview on NBC’s “Meet the Press.”

A bill sponsored by Democratic Sens. Richard Blumenthal of Connecticut and Mark Kelly of Arizona would suspend the federal tax through Oct. 1. A similar measure was sponsored in the House by Democratic Rep. Chris Pappas of New Hampshire.

“Trump’s war of choice with Iran is driving up gas prices across the country — and Americans shouldn’t have to bear the additional economic burden of Trump’s reckless decision making,” Blumenthal said in introducing the bill.

Several states, including Indiana and Georgia, have recently suspended their taxes to alleviate high prices amid the war. Kentucky and Utah have reduced their state tax. Other states are weighing similar suspensions or tax reductions.

There are drawbacks, industry group says

The gasoline tax is the single largest source of revenue for federal highway and public transit programs.

While proposed bills would offset any lost Highway Trust Fund revenue with general funds, the tax suspension could raise the federal deficit and jeopardize the long-term sustainability of investments for highway and public transit programs, according to the American Road & Transportation Builders Association, which represents the transportation construction industry.

The group cites studies showing that many retailers do not pass on the full amount of the gas tax reduction to consumers. Research also suggests that state and federal gas taxes are just one component of a complex pricing scheme that includes the global price of oil and other factors.

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Associated Press writer Kevin Freking contributed to this story.

Matthew Daly, The Associated Press