The U.S. Senate voted to block a war powers resolution directing U.S. President Donald Trump to end military hostilities against Iran, the 9th such vote this year and the first since a U.S.-Iran framework deal was announced.
The Senate failed to adopt the motion, led by Democratic Sen. Raphael Warnock of Georgia, by a 47-48 vote.
The administration has argued that the War Powers Resolution of 1973 - which says the president must remove armed forces from hostilities if Congress has not authorized the war - is unconstitutional.
It has also asserted that a statutory 60-day deadline for the president to terminate the use of force, if he does not have consent from Congress, was paused by a ceasefire in early April, though both sides have carried out attacks since then.