WASHINGTON (AP) — For the 10th time, the Senate will vote on a war powers resolution to block U.S. military action against Iran as lawmakers warily watch President Donald Trump's efforts to resolve a conflict that the administration launched on its own and now needs Congress to fund.
The outcome Tuesday is not expected to be much different from the previous Senate efforts, which have all failed. But a growing number of Republican lawmakers in both the House and Senate have expressed their concerns over both the war and the deal Trump struck with Iran to end it. Democrats are daring the Republicans to join them in standing up to the Trump administration.
“Why is this vote different?” asked Sen. Tim Kaine, the Democrat from Virginia who has led his party's efforts.
Kaine said the pause in fighting, as Trump's team works to shore up a fragile ceasefire, provides the perfect time for Congress to step back and assess “what should the next chapter be.”
The vote also comes as the Pentagon is seeking $80 billion from Congress mostly for the Iran war as it backfills munitions and stockpiles.
Trump himself is headed to the Capitol this week to meet with GOP senators as Vice President JD Vance has been overseas working to negotiate with Iran to end that country's nuclear ambitions — which had been among the stated rationales for the war.
The president is not pleased with the Republicans who have been critical of the deal he struck with Iran, according to one GOP senator granted anonymity to discuss the private dynamics.
The terms of the Iran deal are spelled out in a Memorandum of Understanding that Trump signed last week, starting a 60-day clock for the sides to reach a broader agreement over ending Iran's nuclear program.
But Republicans have particularly objected to the $300 billion fund to help Iran rebuild, which is far greater than the $1.7 billion then-President Barack Obama refunded the country under his administration's 2015 Iran deal.
"I believe President Trump is getting very poor advice on Iran," Sen. Ted Cruz, R-Texas, said last week on his podcast after the deal was made public.
Over and again, Democrats have been forcing votes on the Iran war, almost since the U.S. and Israel launched missile strikes on Iran on Feb. 28.
Nearly each week they're in session, the Senate Democrats have put forward war powers resolutions, but they have failed to amass the majority needed for passage in the narrowly split chamber, where Trump’s Republican Party holds the majority.
The House pushed its own version to passage earlier this month, with four Republicans joining all Democrats in approving the war powers resolution, over the objections of House Speaker Mike Johnson and the GOP leadership.
It’s that House resolution that the Senate will consider Tuesday. While such resolutions do not go to the president for his signature or carry the force of law, passage would stand as a powerful, if symbolic, statement from Congress and a rebuke of the administration’s military actions.
In the past, as many as four GOP senators have voted for the war powers resolutions — Republicans Lisa Murkowski of Alaska, Susan Collins of Maine, Rand Paul of Kentucky and Bill Cassidy of Louisiana. One Democrat, Sen. John Fetterman of Pennsylvania, has typically voted against.
Defense Secretary Pete Hegseth is also on Capitol Hill this week, seeking roughly $80 billion in supplemental funding to shore up defense supplies in the aftermath of the Iran war, which is drawing scrutiny when many Americans are reeling from high gas prices and costs of living.
The Pentagon early on had estimated the war cost $11.3 billion during its first week, and experts have put the overall price tag at close to $100 billion.
The Defense Department's funding request is part of a broader beef-up of military money the White House wants as part of its budget request this year.
The Trump administration is seeking $1.5 trillion in defense funding this year — a 50% increase — including $350 billion that it wants in a so-called budget reconciliation package. Johnson and GOP leaders are working to pass that package on their own, over the objections of Democrats, much the way they approved Trump's big tax cuts bill last year.
The 2025 tax cuts package also included a sizable plus-up of about $175 billion for the military.
Defense Secretary Pete Hegseth speaks in the Oval Office of the White House during an executive order signing about quantum computing with President Donald Trump, Monday, June 22, 2026, in Washington. (AP Photo/Jacquelyn Martin)
In this photo released by Pakistan Prime Minister Office, Iran's President Masoud Pezeshkian, left, shakes hands with Pakistan's Prime Minister Shehbaz Sharif during a welcome ceremony in Islamabad, Pakistan, on Tuesday, June 23, 2026. (Pakistan Prime Minister Office via AP)
Senate Majority Leader John Thune, R-S.D., joined from left by Sen. Tom Cotton, R-Ark., Sen. James Lankford, R-Okla., and Sen. Shelley Moore Capito, R-W.Va., speaks to reporters after a closed-door meeting with fellow Republicans, at the Capitol in Washington, Tuesday, June 2, 2026. (AP Photo/J. Scott Applewhite) CORRECTION: Sen. Tom Cotton, R-Ark., not Sen. Josh Hawley, R-Mo.
