Chris Murphy a win Wednesday when it approved a resolution seeking to end USA support for the Saudi Arabia-led coalition in the war in Yemen. Bernie Sanders, I-Vt., left, and Sen. Susan Collins of Maine, Steve Daines of Montana, Mike Lee of Utah, Jerry Moran of Kansas, Lisa Murkowski of Alaska, Rand Paul of Kentucky and Todd Young of Indiana.
The vote was 54-46 in the Senate, more than the 51 needed to pass in the 100-member Senate, as seven Republicans joined Democrats in backing the measure.
He added that a vote in favor would "begin the process of reclaiming our constitutional authority by ending United States involvement in a war that has not been authorized by Congress and is unconstitutional".
The White House has threatened to veto the bill, arguing that U.S. support for the Saudi coalition does not amount to "hostilities".
Lawmakers in the Republican-controlled chamber approved a historic curtailment of presidential war powers that directs Trump "to remove United States Armed Forces from hostilities in or affecting the Republic of Yemen" within 30 days.
"Because the president has directed United States forces to support the Saudi-led coalition under his constitutional powers, the joint resolution would raise serious constitutional concerns to the extent that it seeks to override the president's determination as commander in chief", the White House said in a statement this week.
The resolution would not curtail US special forces involved in fighting al Qaeda or allied terrorist groups - a mission that Congress explicitly authorized in 2001. Lawmakers from both parties have criticized Trump for not condemning Saudi Arabia strongly enough for the killing.
Chris Murphy, D-Conn., who co-sponsored the Sanders bill along with Sen.
It is now expected to be voted on in the US House of Representatives.
The war has also worsened the humanitarian crisis in Yemen, where millions face starvation.
"The Senate's vote to end the US role in Yemen is also a vote to re-democratize our nation's foreign policy".
"We need to stay engaged with the limited engagement that we have", said Senator Jim Risch, the Republican chairman of the Foreign Relations Committee. "This resolution sends a awful message of US division and lack of resolve, and sets a bad precedent for using the War Powers Resolution to express political disagreements with a president".
The 1973 law was supposed to provide a check on the growing number of global military entanglements presidents committed the U.S.to, without actually seeking a war declaration or other authorization from Congress.
Bernie Sanders (I-VT) and Mike Lee (R-UT), among others, seeks to end any and all USA involvement in the Saudi-led conflict, including providing targeting support for Saudi airstrikes in the war-torn country.
"We have been providing the bombs the Saudi-led coalition is using, refueling their planes before they drop those bombs and assisting with intelligence", Sanders said during a speech on the Senate floor ahead of the vote.
"We are made weaker in the eyes of the world when we willingly participate in war crimes, when we allow our partners to engage in the slaughter of innocents", Murphy said.