For the first time since the Iran conflict began, both chambers of Congress have moved to block continued US involvement.
The Senate voted 50 to 48 on a House-passed measure directing President Trump to remove US forces from hostilities with Iran.
Four Republicans joined Democrats:
Susan Collins.
Lisa Murkowski.
Bill Cassidy.
Rand Paul.
The vote is significant because it marks the first time both the House and Senate have passed this type of resolution during the conflict.
But there is an important detail:
The measure is a concurrent resolution.
It does not go to the president for a signature.
It cannot be vetoed.
The White House called it ineffective.
Still, the political message is clear.
Many lawmakers are pushing back against a war they believe could expand without congressional approval.
The vote comes while the Trump administration is working through ceasefire and peace negotiations with Iran.
Supporters say Congress is doing its job by limiting presidential war powers.
Critics argue lawmakers are weakening the administration during sensitive negotiations.
Either way, the vote shows the Iran conflict is creating a major divide inside Washington.
The question now is whether this remains a symbolic warning or becomes a bigger fight over who controls the next steps.