WASHINGTON (AP) — The House on Thursday narrowly passed a resolution to halt U.S. military action in Iran, sending a warning to President Donald Trump for the second time as the war has escalated and the future of the conflict is increasingly uncertain.

The 214-208 vote requiring congressional approval for the war comes as the Senate is expected to consider a similar resolution later Thursday morning. Though the votes forced by Democrats are largely symbolic, they are meant as a strong signal to the Republican president that his support on Capitol Hill is chipping away as the war drags on and lawmakers in both parties have questioned his administration’s endgame.