The US Senate voted on Tuesday to increase congressional oversight of military action against Iran, with four Republicans joining Democrats in backing a war powers resolution.
The measure passed the Senate by 50 votes to 47, marking the first time the chamber approved legislation asserting a greater congressional role in decisions over the conflict with Iran.
Even if the resolution passes both chambers of Congress, US President Donald Trump could still veto it.
Republicans had previously voted in several congressional ballots to leave decision-making authority over the conflict largely in the hands of the president. The Democrats' aim with the resolution is to end the war with Iran.
The War Powers Resolution was first enacted in 1973 in response to the Vietnam War. Under the law, a US president can conduct military operations independently for 60 days before requiring congressional approval.
The Senate majority was made possible by four Republicans who broke with their party leadership. Among them was Bill Cassidy, who had voted against similar measures in the past. Cassidy changed his position after losing his state's Republican primary without Trump's backing.
