The US Senate has approved legislation directing President Donald Trump to end American military involvement in the conflict with Iran, marking one of the most significant congressional challenges to presidential war powers in decades.
The War Powers Resolution, passed on Tuesday by a 50-48 vote, reflects growing concern in Congress over continued US military action against Iran and represents a rare instance of bipartisan opposition to the Republican president’s foreign policy.
Senate approves historic War Powers Resolution
The Senate approved the measure largely along party lines, with four Republican senators joining nearly all Democrats in voting for the resolution. One Democrat opposed the measure, while two Republican senators did not vote.
The legislation follows earlier approval by the House of Representatives, making it the first time both chambers of Congress have passed a resolution directing a president to withdraw US armed forces from active hostilities under the War Powers Resolution of 1973, commonly known as the War Powers Act.
Although largely symbolic at this stage, the vote signals increasing willingness among lawmakers—including some Republicans—to challenge the president’s military decisions.
What does the War Powers Resolution mean?
The War Powers Act of 1973 was enacted to limit a president’s ability to engage US armed forces in prolonged military conflicts without congressional approval.
Unlike ordinary legislation, resolutions passed under the War Powers Act are not sent to the president for signature or veto. Instead, they express Congress’s constitutional authority over military engagements.
Supporters argue that the measure reinforces Congress’s role in authorising military action, while critics question whether it can legally compel the executive branch to alter military operations.
White House says measure is not binding
The White House has maintained that the Senate-approved resolution is unconstitutional and therefore not legally binding on the administration.
The Trump administration is expected to continue pursuing negotiations aimed at reaching a peace agreement with Iran despite the congressional vote.
Legal experts say the constitutional validity of the resolution remains uncertain and could ultimately be decided by US courts.
Legal experts expect constitutional challenge
Scott Anderson, a senior fellow at the Brookings Institution and senior editor at the legal publication Lawfare, said the executive branch is likely to disregard the resolution on constitutional grounds.
According to Anderson, it remains unclear who would have legal standing to challenge the administration’s actions in court, although he expects litigation over the issue.
The legal uncertainty means the measure’s immediate practical impact on US military operations may be limited despite its political significance.
House also backed the resolution
Earlier this month, the House of Representatives approved the same resolution by a 215-208 vote, with four Republicans joining Democrats in supporting the measure.
The combined votes in both chambers represent an unusual bipartisan effort to reassert congressional authority over military action and serve as a notable political setback for President Trump, whose party holds narrow majorities in both the Senate and House.