This is seen as the latest test of Trump's control over his fellow Republicans.

Senator John Thune of South Dakota, the Chamber's Republican Majority Leader, said he expected the first procedural voting on Tuesday, but he did not know whether he had enough votes for the measure to pass without amendments.

"I'm fine with it as is, but I think we have colleagues who would like to see some perhaps modest changes made, and so we're trying to find out if there's a path forward that gets us 51 and stays consistent with what the White House proposed in terms of the rescissions package," Thune told reporters.

The Senate has until Friday to act on the rescissions package, a request to claw back $8.3 billion in foreign aid funding and $1.1 billion for public broadcasting. Otherwise, the request will expire and the White House will be required to adhere to spending plans passed by Congress.

--Reuters--