The Senate voted Tuesday to block an effort to end U.S. military assistance to Saudi Arabia’s war in Yemen amid a growing humanitarian crisis there, until Congress votes to approve military action.

The chamber voted to kill a motion by Sens. Bernie Sanders, I-Vt., Mike Lee, R-Utah, and Chris Murphy, D-Conn., to discharge their resolution from the Senate Foreign Relations Committee and bring language to the floor that would have stopped U.S. help to Saudi forces in selecting airstrike targets, refueling aircraft, and sharing intelligence in the fight against Iran-backed Houthi rebels.