BY MIRABEL ODDETA
The U.S. Senate voted Tuesday to advance a war powers resolution aimed at limiting President Donald Trump’s authority to continue military operations against Iran, marking a rare bipartisan challenge to the administration and intensifying an ongoing constitutional dispute between Congress and the White House.
The measure, which passed the Senate 50–48 after clearing the House earlier this month, directs the president to halt U.S. involvement in hostilities connected to Iran. The conflict in question began on February 28, when the United States and Israel carried out joint military action against Iranian targets, according to lawmakers supporting the resolution.
The vote represents one of the most significant uses of congressional war powers in decades and is the first time both chambers have approved a resolution seeking to end active military operations since the War Powers framework was established in 1973. That law, known as the War Powers Resolution, was designed to ensure congressional oversight of military engagements initiated by the executive branch.
Supporters of the measure argue that the Constitution assigns Congress the authority to declare war and that continued military action without explicit authorization violates that balance. The resolution was backed by nearly all Democrats and a small group of Republicans, reflecting growing unease within parts of the Republican caucus over the scope and duration of the conflict.
Among Republicans, Senators Susan Collins, Rand Paul, Bill Cassidy, and Lisa Murkowski joined Democrats in support of the measure. Senator John Fetterman voted against it, while other Republican senators, including Senate GOP leadership, largely opposed the resolution or were absent from the vote.
The U.S. House of Representatives also narrowly approved the measure earlier this month, further underscoring divisions within Congress as the war continues to shape domestic political debate ahead of upcoming elections. Republicans currently hold narrow majorities in both chambers, but internal disagreements have become more visible as the conflict persists.
The Trump administration sharply criticized the vote. Officials argued that the resolution has no legal force because it does not require presidential approval and does not carry the status of law. The White House has also maintained that the War Powers framework is not constitutionally binding and therefore cannot restrict presidential military authority in this context.
In a statement following the vote, Trump called the measure “poorly timed and meaningless,” saying it would embolden Iran and complicate diplomatic efforts aimed at ending the conflict. The administration has said it is pursuing negotiations intended to stabilize the situation and potentially secure a broader agreement.
The resolution’s sponsor in the House, Representative Gregory Meeks, said the vote reflects Congress’s constitutional responsibility to oversee military action. Supporters argue that repeated military engagement without formal authorization risks undermining the separation of powers and sets a precedent for expanded executive war authority.
Legal scholars and congressional aides remain divided over whether the measure carries binding force. Under the 1973 War Powers framework, concurrent resolutions are intended to compel withdrawal of U.S. forces from unauthorized hostilities. However, past Supreme Court precedent and executive branch interpretations have questioned whether such measures are enforceable without presidential assent.
Some constitutional experts argue the dispute is likely to be resolved in the courts, particularly if the administration continues military operations despite congressional opposition. Others note that enforcement mechanisms remain unclear, making the resolution’s practical impact uncertain even if its political significance is substantial.
The vote comes as public opinion appears to be shifting against the conflict. Recent polling suggests a majority of Americans are skeptical about the costs and benefits of continued military engagement in Iran and doubt that any ceasefire or diplomatic agreement would hold.
Within Congress, additional war powers votes are expected in the coming weeks, as lawmakers from both parties continue to debate the scope of presidential authority over military operations. A separate issue also looms over whether any future peace agreement with Iran could require congressional review under existing statutes governing international nuclear agreements.
Senate Republican leadership has indicated that Congress is likely to assert a role in reviewing any eventual deal with Tehran, setting up further potential clashes between the legislative and executive branches over foreign policy authority and the conduct of the war.
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