WASHINGTON (AP) — The U.S. Senate voted 50-48 on Tuesday to approve a war powers resolution directing President Donald Trump to end unauthorized military involvement in the conflict with Iran, marking the first time the chamber has passed such a measure related to the current war. Four Republican senators joined Democrats in support of the resolution, while one Democrat voted against it. The measure follows months of fighting that began in late February after U.S. and Israeli military operations against Iran and comes amid continuing efforts by lawmakers to reassert Congress’ constitutional role in decisions involving armed conflict.

The resolution had already passed the House of Representatives earlier this month, making it the first war powers measure approved by both chambers of Congress since the War Powers Resolution became law in 1973. Although the measure does not require the president’s signature and its legal effect remains disputed, supporters say it reflects growing concern among lawmakers from both parties over military actions undertaken without explicit congressional authorization. Previous attempts to advance similar legislation in recent months had failed in the Senate despite repeated efforts by lawmakers seeking greater oversight of U.S. involvement in the conflict.