The House is set to vote on a measure directing President Trump to withdraw U.S. forces from Iran or secure Congressional approval to continue the war. Republican leaders previously postponed the vote to avoid an embarrassing defeat, but they can no longer delay due to the War Powers Resolution requirements that mandate consideration within a limited timeframe.

Three House Republicans previously sided with Democrats on a similar resolution that failed on a tie vote, indicating growing opposition to the military campaign now in its fourth month. The vote represents a significant rebuke to Trump's handling of the war after he has repeatedly dismissed efforts by Congress to curb his power, with the GOP historically deferring to him on military matters.

The vote comes as divisions between congressional Republicans and the president have surfaced on multiple issues, including a recent Senate Republican-led rejection of Trump's $1 billion security funding request. Market watchers are closely monitoring how this political rift might affect defense spending priorities and military contractor stocks, which have been volatile amid the ongoing conflict.

The legal authority of Congress to force a president to withdraw troops remains contested, with Trump and his aides dismissing such efforts as unconstitutional. Despite these constitutional questions, the Senate's recent vote to advance a similar measure suggests increasing willingness by some GOP members to pressure Trump to end a conflict that a majority of Americans consider not worth the costs.