US Senate Passes Historic War Powers Resolution Rebuking Trump Over Iran Conflict

Bipartisan vote marks first time both chambers have approved measure directing president to end military action since 1973

The Republican-controlled US Senate has approved a war powers resolution demanding that President Donald Trump halt military action against Iran or seek congressional authorization to continue hostilities, delivering the most significant bipartisan rebuke of the president since his return to office. The resolution passed by a 50-48 vote on Tuesday, with four Republicans joining Democrats in support of the measure. The same measure was passed by the US House of Representatives earlier this month by a 215-208 vote, with four Republicans crossing party lines.

However, the resolution is largely symbolic—it is a concurrent resolution expressing the sentiment of Congress rather than legislation that carries the full force of law, and it will not be sent to the president for his signature or veto. Middle East analyst Laura Blumenfeld described it as “more of a slap on a wrist than a handcuff” because it has no legal binding effect. In practice, the vote is unlikely to have much impact on the currently frozen conflict with Iran. Experts believe Trump is likely to ignore it—as has every US president since the War Powers Resolution was enacted—and any legal challenges would likely produce no result. Scott Anderson, a senior fellow at the Brookings Institution, noted: “The executive branch will likely ignore it on constitutional grounds, and it’s not clear who might have standing to sue to enforce it.”

The vote marks the first time since the War Powers Resolution of 1973 that both chambers of Congress have approved a concurrent resolution instructing a president to end a military action. The law was born out of a clash between Congress and President Richard Nixon over the Vietnam War, with lawmakers overriding his veto in an effort to reclaim authority over decisions of war. Michael Glennon, a professor of international law at Tufts University, called the vote “almost unprecedented,” noting that “You have both houses of Congress, which are under the control of the Republican Party, standing up to the president and saying no.” He added that Trump has been “very effective” in exacting retribution against dissident Republicans who oppose him, making this “a watershed event.”

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Senate Democratic Leader Chuck Schumer blasted the war on the Senate floor, declaring: “Time after time, the vast majority of Senate Republicans sided with Trump and his war instead of the American people. The American people have paid the price for Trump’s historic blunder in Iran. It’ll go down in the history books as one of the worst foreign policy forays America has ever made.” The vote reflects growing unease among Republicans over both the war and the ceasefire deal Trump struck with Iran. The conflict has become deeply unpopular with the American public amid skyrocketing petrol prices and enormous financial costs, with the Pentagon seeking approximately $80 billion from Congress to pay for the war.

The four Republican senators who voted with Democrats were Rand Paul of Kentucky, Lisa Murkowski of Alaska, Susan Collins of Maine, and Bill Cassidy of Louisiana. Senator John Fetterman of Pennsylvania was the only Democrat to vote against the measure. The vote was aided by the absence of two Republican senators who have consistently opposed such efforts: former Senate Republican leader Mitch McConnell, who was recently hospitalized for an undisclosed matter, and Senator Dave McCormick of Pennsylvania. A White House official told the BBC that the measure only passed because of these absences, and noted that with the ceasefire agreed on 7 April, there are “no hostilities from which to withdraw American forces.”

President Trump sharply criticized the resolution on his Truth Social platform, calling it “poorly timed and meaningless.” “So, I have Iran on the ‘ropes,’ ready to go down for the fall, willing to give us practically anything, and for the first time in decades, respecting the hell out of the United States and its President, ME, and the U.S. Senate decides to have a poorly timed and meaningless War Powers Act Vote,” Trump wrote. He added: “These Senators have just made my job more difficult, but I will get it done, one way or the other, because I always get it done!” Trump also labeled the four Republican senators who voted in favor as “Republican Losers.”

Federal law requires congressional approval to continue military actions for more than 60 days. The US-Israel strikes on Iran began on 28 February, although the Trump administration has argued April’s ceasefire reset the clock. The White House can also extend the deadline for another 30 days, citing national security. Currently, the US and Iran have agreed to continue a ceasefire and are working towards an end of hostilities under a memorandum of understanding signed by both presidents last week. Under that memo, Washington and Tehran have 60 days to negotiate a broader agreement on ending Iran’s nuclear programme, with Vice President JD Vance leading the American delegation in talks in Switzerland.

Whether the vote represents a harbinger of more opposition to the president remains unclear. Jonathan Entin, a constitutional law professor at Case Western Reserve University, cautioned: “I wouldn’t overreact to the significance of this vote. It’s important… but I’m not sure that we should view it as a sign of consistent conflict, or additional conflict, with the president.” According to Entin, the upcoming November midterm elections in the US mean that while a handful of Republicans may wish to signal independence from Trump to bring in independent voters, many others will be hoping to avoid drawing his ire. “There are constraints,” he said. “The president has overwhelming support among Republicans. A candidate who pushes back too much might risk alienating strong Republican voters who think they aren’t committed enough.”

The vote exposes deepening divisions among Republicans ahead of November’s midterm elections, where control of both chambers of Congress hangs in the balance. It was the latest sign of division among Trump’s fellow Republicans, who have recently resisted the president on other fronts, including by rejecting his plans to create a $1.8 billion “anti-weaponisation” fund and approving Ukraine aid. The Tuesday vote was the 10th time Senate Democrats have forced a war powers vote since the start of the conflict.

US Senate Passes Historic War Powers Resolution Rebuking Trump Over Iran Conflict