The Senate on Wednesday moved toward voting to end U.S. support for the Saudi-led military campaign in Yemen.

If senators approve the resolution it would mark a significant rebuke of Trump, who told Reuters this week that he was standing by the Saudi government and believed it had been a "very good ally."

ADVERTISEMENT Senators had been expected to hold a final vote on the bill on Wednesday, but as of Wednesday evening they were still haggling over potential amendment votes. The delay isn't expected to impact final passage of the vote, which is now expected to take place on Thursday.

Because supporters are bringing up the Yemen resolution under the War Powers Act they only need a simple majority to get it through the Senate. Eleven Republican sided with all 49 Democrats to start debate on the measure on Wednesday.

To prevent a lengthy, unwieldy fight on the Senate floor, senators also voted 96-3 to require that any amendments to the resolution be on topic. Under Senate rules lawmakers can debate the resolution for up to 10 hours before a final vote.

The Senate votes comes as frustration is mounting on Capitol Hill over the U.S.-Saudi relationship, with a growing number of senators convinced that Saudi Crown Prince Mohammed bin Salman ordered the slaying of Washington Post contributor Jamal Khashoggi.

But most Republicans are expected to oppose the Yemen resolution, which they worry is a misuse of the War Powers Act.

He added that the dynamic presents "challenging circumstances" but "the Sanders-Lee resolution is neither precise enough or prudent enough.” Instead, he publicly threw his support behind a forthcoming resolution from Corker. Corker has been negotiating for days with Senate leadership on the resolution, in the hopes that it could get a Senate vote as soon as this week. An overwhelming vote, he hopes, would pressure House leadership to quickly pass it before the end of the year. “A strong denouncing of a crown prince and holding them responsible for the murder of a journalist. It’s a pretty strong statement for the United States Senate to be making, assuming we can get a vote on it,” Corker told reporters this week.

Senators voted 60-39 to formally begin debate on the resolution, which would requireto withdraw troops in or "affecting" Yemen within 30 days unless they are fighting al Qaeda.