The U.S. Senate advances a war powers resolution aimed at restricting President Donald Trump’s ability to take or continue military action against Iran without congressional authorization. On Tuesday, Sen. Bill Cassidy (R-La.)—who recently lost his bid for reelection in Louisiana’s Senate Republican primary—joins three other Republicans in supporting the measure, bringing the total to four GOP senators backing it. The other Republicans cited by the reports are Rand Paul (R-Ky.), Susan Collins (R-Maine), and a fourth Republican senator (identified in one account alongside Paul and Collins). The resolution directs the president to withdraw U.S. armed forces deployed against Iran unless Congress approves continued action. Multiple outlets describe the move as a break from the White House, with the group voting to advance the measure over the administration’s position. Deutsche Welle characterizes the effort as largely symbolic and unlikely to become law, but notes that the Senate’s action signals increasing congressional frustration regarding the war. The resolution proceeds through Senate steps after Tuesday’s vote, setting up further consideration.