Anti-war groups and progressive lawmakers expressed cautious optimism this weekend after the Trump administration announced it would end its policy of refueling Saudi planes that are engaged in Saudi Arabia's assault on Yemen—but called for bolder and broader policy changes to ensure an end to the attacks that have killed more than 15,000 civilians.

On Friday, the Washington Post reported that the refueling practice would end, with Saudi Arabia claiming in a statement that it now has the ability to refuel its own planes—a claim that U.S. Defense Secretary James Mattis bolstered in his own comments on the policy changem but that drew skepticism from critics. The change came amid heightened calls from across the political spectrum to end the U.S. military's cooperation with the Saudis, following the killing of journalist Jamal Khashoggi.

lol at Mattis' lame spin The truth: they're hoping to preempt a congressional intervention while maintaining their arms deals. This is no time to let up the pressure.

https://t.co/4gYYofv4SC — Elizabeth Beavers (@_ElizabethRB) November 10, 2018

Progressives including Rep. Ro Khanna (D-Calif.) and Sens. Chris Murphy (D-Conn.) and Bernie Sanders (I-Vt.) have called for an end to U.S. participation since long before Khashoggi, a Saudi who wrote critically of his home country's government, was killed by Saudi agents in October.

Khanna and Sanders both said they would take action in Congress to hold the administration accountable for its pledge to end refueling efforts.

"When it comes to Yemen, talk is cheap and those on the brink of starvation can't afford any political stunts. The world is watching to see if this is merely more empty promises or if the United States will finally use its power to end the suffering in Yemen." —Kate Kizer, Win Without WarCalling the decision one that "could avert a humanitarian crisis," Khanna told The Intercept that Congress should now pass Senate Resolution 54 and House Resolution 138, which direct the president to remove U.S. forces entirely from the war in Yemen unless they have been authorized by Congress.

"Similar to what we did in Somalia's case, when the White House said that we weren't going to have any intervention, Congress went ahead and passed both of the War Powers Resolution [measures], just to make sure that was definitive," Khanna said, referring to Congress's urging of President Bill Clinton to limit U.S. involvement in Somalia in 1993.

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"I'm glad that the Trump administration is ending U.S. refueling of Saudi aircraft in Yemen's devastating war... U.S. participation in this conflict is unauthorized and unconstitutional and must end completely," Sanders said in a statement. "I will soon bring Senate Joint Resolution 54 back to the floor for another vote, so the Senate can compel an end to U.S. participation in the Yemen war as a matter of law, not simply as a matter of the president’s discretion."

But other critics of the country's involvement in the war, which has devastated the impoverished country since it began in 2015 as the Saudi coalition has supported the Yemeni government in its attempt to defeat the Houthis, say the U.S. must go much further to ensure that the assault can't continue.

"Why are we still helping the Saudis with targeting? Why are we still selling them the bombs at a discount?" Murphy said. "Now that it's no longer a secret that the war in Yemen is a national security and humanitarian nightmare, we need to get all the way out."

Yemen is in crisis – and we can no longer look the other way. Cutting off US refueling support is a start, but it’s too little, too late. We cannot continue selling the Saudis weapons that kill Yemeni civilians. We cannot continue to support this war. https://t.co/N9PmkB2LJb — Elizabeth Warren (@SenWarren) November 10, 2018

"Congress and the public must not rest until the United States ends all military assistance to the Saudi-led coalition, which also includes consultation on targets, other intelligence, and weapons sales," said Kate Kizer, policy director for Win Without War.

"When it comes to Yemen, talk is cheap and those on the brink of starvation can't afford any political stunts. The world is watching to see if this is merely more empty promises or if the United States will finally use its power to end the suffering in Yemen," she added.

Kevin Martin, president of Peace Action, also demanded that Congress, now with Democratic control of the House, use its new power to stand up to the executive branch and take further action to end the war.

"Congress must pass the Yemen war powers resolutions to bind the administration to this policy shift...and to reclaim its constitutional authority on the question of war," Martin said. "This war was illegal from the start, and it's time for Congress to stand up and say so."