The Republican-led chamber voted 215-208 for the measure on Wednesday, with four Republican members joining Democrats. The vote does not by itself end the military campaign, but it places fresh pressure on the White House and sends the resolution to the Senate, where its prospects remain uncertain. Even if the Senate approves it, Trump could veto the measure, leaving opponents needing two-thirds majorities in both chambers to override him.
The resolution was brought under the War Powers framework, which was designed to restrain presidents from sustaining military operations without congressional approval. Its supporters argued that the administration had stretched executive authority by keeping US forces involved in the Iran conflict after the initial strikes and beyond the period in which Congress expects to have a decisive role.
The measure was advanced as unease deepened in Congress over the costs, risks and strategic aims of the campaign, which began in late February after US-Israeli strikes against Iranian targets. Trump has defended the operation as necessary to prevent Tehran from advancing its nuclear programme and to protect US interests in the region. Critics say the administration has not provided a clear legal basis, military end-state or diplomatic path for the conflict.
The four Republicans who crossed party lines were Thomas Massie of Kentucky, Brian Fitzpatrick of Pennsylvania, Tom Barrett of Michigan and Warren Davidson of Ohio. Their votes proved decisive in a chamber where the Republican majority is narrow and where foreign policy divisions have become sharper as the conflict has lengthened.
Democrats framed the vote as an assertion of Congress’s constitutional authority over war. Representative Gregory Meeks of New York, a senior Democrat on the House Foreign Affairs Committee, argued that the administration had bypassed the legislature and put US forces at risk without a formal authorisation. Supporters of the resolution said the issue was not whether Iran posed a threat, but whether a president could continue hostilities without explicit approval from Congress.
Republican leaders opposed the move, warning that it could weaken Trump’s negotiating position and signal division to Tehran. House Speaker Mike Johnson and other administration allies said the president required flexibility to respond to threats in the Middle East and protect American personnel. They also argued that a ceasefire and changing battlefield conditions had undercut the case for forcing a withdrawal through Congress.
The White House has maintained that hostilities have been limited and that the president acted within his constitutional powers as commander-in-chief. Administration officials have also said the campaign created pressure on Iran to return to negotiations. That argument has not settled the dispute on Capitol Hill, where lawmakers from both parties have questioned whether military action has made a nuclear agreement easier or more difficult.
Iranian officials have offered a more guarded account of the diplomatic track, saying negotiations have not produced tangible progress. Trump has signalled optimism, telling reporters that an agreement could still be reached, while warning that the ceasefire would not restrain US action if American personnel were attacked. The gap between those positions has added uncertainty to a conflict already complicated by Israel’s role, regional shipping disruption and the wider confrontation involving Iranian-backed groups.
The vote also exposed broader political strains for Trump as midterm campaigning begins to intensify. Public anxiety over energy prices, regional escalation and the deployment of US forces has given war-powers advocates more room to challenge the administration. Some Republicans who generally support Trump have shown reluctance to grant open-ended backing for operations that could widen into a longer Middle East war.
The legal debate remains unsettled. The War Powers Resolution requires presidents to notify Congress after introducing forces into hostilities and places limits on the duration of such involvement without authorisation. Successive administrations from both parties have disputed parts of the law, arguing that presidents retain broad authority to use force. Congress has often struggled to enforce its position, particularly when lawmakers are divided on the underlying military operation.
