Three senators will attempt to use congressional authority to get the United States to pull out of Saudi Arabia’s war in Yemen.

Republican Mike Lee of Utah, Democrat Christopher S. Murphy of Connecticut, and independent Bernie Sanders of Vermont will attempt to use a provision in the 1973 War Powers Act, Reuters reported. 

The provision allows any U.S. senator to introduce a resolution to withdraw from a conflict that has not been authorized by Congress.

“We believe that, as Congress has not declared war or authorized military force, this conflict (in Yemen) is unconstitutional and unauthorized,” Sanders said at a conference.

Senate Majority Leader Mitch McConnell did not respond to Reuters for comment about how the resolution would move forward.

“This horror is caused in part by our decision to facilitate a bombing campaign that is murdering children, and to endorse a Saudi strategy inside Yemen that is deliberately using disease and starvation and the withdrawal of humanitarian support as a tactic,” Murphy said in a statement.

Lee’s statement was mainly focused on the powers of Congress being “willfully eroded.”

“Successive presidents have claimed that power-and the politicians in Congress have been only too happy to give it away, in order to avoid tough votes,” he said in a statement.

The United States has backed Saudi Arabia in its fight against Houthis in Yemen and in an attempt to reinstall president Abd-Rabbu Mansour Hadi.

But members of Congress like Murphy have long been critical of the toll it has taken on civilians and how it is verging on a humanitarian crisis.

Heading to the Senate floor to talk about the Saudi blockade in Yemen and how U.S. support for the Saudi coalition has made us complicit in this humanitarian nightmare.

— Chris Murphy (@ChrisMurphyCT) November 14, 2017

Our endorsement of the humanitarian nightmare in Yemen must end. It’s time for Congress and the American people to speak out. pic.twitter.com/UDoRvBMBO0

— Chris Murphy (@ChrisMurphyCT) November 18, 2017

Murphy teamed with Republican Sen. Rand Paul last year to try to prevent arms sales to Saudi Arabia for its war in Yemen.  

Just announced @RandPaul and I are introducing resolution to stop portion of Saudi arms sale that will be used to continue Yemen war.

— Chris Murphy (@ChrisMurphyCT) May 25, 2017