On June 23, 2026, Senate Democrats, along with a few Republicans, passed a war powers resolution rebuking President Donald Trump's military actions in Iran. The resolution passed with a vote of 50 to 48, aided by the absence of key Republican senators. Notably, this resolution does not have legally binding power and will not be sent to the president for approval. Senators Rand Paul, Susan Collins, Lisa Murkowski, and Bill Cassidy were among the Republicans who supported the resolution.
The vote follows a memorandum of understanding (MOU) signed between the U.S. and Iran, which has raised concerns among some Republicans about the implications of the agreement. Senate Armed Services Committee Chair Roger Wicker criticized the MOU, particularly a proposed $300 billion reconstruction fund, stating it undermines previous military successes. Other Republicans expressed concerns over the potential lifting of sanctions on Iranian oil. Senate Majority Leader John Thune emphasized the need for conditions tied to Iranian behavior regarding sanctions.
Senator Tim Kaine suggested that Congress should reassess its role in decisions related to military action, advocating for a more collaborative approach to diplomacy and funding.