The U.S. Senate is scheduled to vote Wednesday on a war powers resolution that would require President Donald Trump to seek congressional approval before continuing military operations against Iran. The legislation, introduced by Democratic Senators Tim Kaine, Adam Schiff and Minority Leader Chuck Schumer, would force an end to current U.S. participation in the conflict and mandate congressional authorization for any future military action.

The resolution faces an uphill battle in the Republican-controlled Senate, where Majority Leader John Thune has indicated GOP lawmakers will vote against it, arguing that Trump is "acting in the best interest of the nation." Democrats would need at least five Republicans to join them for the measure to pass. Even if successful, the resolution would likely face a presidential veto.

Trump launched the military campaign against Iran on Saturday without congressional approval. The conflict has already resulted in casualties, including six U.S. military members killed in a drone strike in Kuwait over the weekend. Secretary of State Marco Rubio told reporters Tuesday that the administration would not "put American troops in harm's way," though Trump has not ruled out deploying ground forces.

The Trump administration's stated objectives for the military action have shifted, ranging from regime change to preventing Iran's nuclear weapons development to targeting the country's naval and missile capabilities. Trump has expressed hopes of ending the bombing campaign within weeks, but has provided no clear exit strategy for the expanding conflict.

The House of Representatives is expected to vote on a similar resolution Thursday. House Speaker Mike Johnson expressed confidence that Republicans have the votes to defeat the measure, while Democratic leader Hakeem Jeffries predicted strong Democratic support for the war powers resolution.

The votes represent a significant test for lawmakers as they weigh constitutional authority over military action against executive powers during an active conflict. The War Powers Act requires presidents to withdraw troops from conflicts within 90 days without congressional authorization.