Senators are preparing for a possible vote on Friday if the House is able to send them an amended government funding bill.

Senators and aides say they've been told to tentatively plan for a vote around noon on Friday, even as scores of senators have already left Washington after passing a seven-week stopgap funding measure on Wednesday night.

The plan is tentative and underscores the level of uncertainty injected into the funding fight after President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE told House lawmakers on Thursday that he wouldn't sign the Senate bill due to its lack of funding for his proposed border wall.

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Without a deal, a partial government shutdown will begin on Saturday.

"The leader's office sent out a notice to expect a possible vote around noon tomorrow, but I think the emphasis was on 'possible,'" said Sen. Roy Blunt Roy Dean BluntSocial media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Mo.).

House Republicans unveiled a proposal Thursday to add $5 billion for the border wall as well as disaster aid money to the Senate's seven-week stopgap measure, known as a continuing resolution or CR.

House members cleared a rule governing debate of their new bill on Thursday evening. They still need to approve the legislation.

Even in the House is able to pass the legislation with border wall funding, it's considered dead on arrival in the Senate.

Sen. David Perdue (R-Ga.) said that depending on what happens in the House, senators were expected to get a 24-hour vote notice and "then we'll come back and work through the weekend."

Blunt acknowledged that a bill with $5 billion could not pass in the Senate. And GOP senators left a closed-door lunch earlier Thursday in visible disbelief that Trump was refusing to sign the bill they passed the previous night.

“I’m not sure what leverage the president thinks he has at this moment. I think the way you create leverage is keep this issue alive” into next year, Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Wis.) told reporters.

Senate leadership had projected confidence on Wednesday that Trump would sign seven-week funding measure that they passed as long as it was "clean."

But that unraveled Thursday when House Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) told reporters that Trump said during a closed-door meeting that he wouldn't sign the bill.