Sen. Bill Cassidy voted with the majority of Republicans late Wednesday to block a resolution aimed at reining in the president's war powers.
Congress returns from its two-week recess early this week -- thrusting lawmakers back into the debate surrounding the Iran war as the President Trump's strategy faces continued scrutiny.
House Speaker Mike Johnson and Senate Majority Leader John Thune announced a plan for the Republican-controlled Congress to fully fund DHS "in the coming days."
President Trump is encouraging Congress to cut its recess short and fund the Department of Homeland Security, White House press secretary Karoline Leavitt said.
Trump's action came after House Republicans rejected a Senate-passed bill to fund most of DHS. The House late Friday night passed a bill to fund the entire department through May 22, but many senators are now in recess.
The Senate has voted to confirm Markwayne Mullin as the new secretary of Homeland Security.