Senate Majority Leader Mitch McConnell has scheduled a 10 p.m. procedural vote for Friday, with a government shutdown looming at midnight. It is unclear if Republicans have the votes to advance the bill. 

The passage of the bill is far from certain. As a Democratic senator told CBS News’ Nancy Cordes, “We won’t know until we get there.” One senator pegged the chances of temporary shutdown — lasting, perhaps, through part of the weekend — at chances of 3 to 1.

The Senate Democratic Caucus has scheduled an 8:30 p.m. meeting to discuss strategy. The Senate’s scrambling comes after the House passed a short-term spending bill Thursday night.

Late Friday afternoon, Office of Management and Budget Director Mick Mulvaney said he thinks there is a good chance Congress will reach a deal before Monday, not offering much hope for a deal by midnight. Mulvaney floated the possibility of weekend votes.

“If the Senate changes anything it’s going to have to back to the House,” Mulvaney told reporters just before 6 p.m. “Now in theory, the Senate could deal with it before midnight and the House could in some fashion deal with it before midnight. It’s more likely that if the Senate makes any changes it would take the House a while to get everybody back for the vote.”

On Friday afternoon, Mr. Trump spoke with Ryan by phone, according to a source familiar with the communication.

Before that, Senate Minority Leader Chuck Schumer, D-New York went to the White House after an invitation from President Trump. The president, his chief of staff, John Kelly, and Schumer and his chief of staff met alone in the Oval Office, Margaret Brennan reports. according to a White House official. Schumer told reporters afterward that progress had been made, but there’s no deal yet. 

“We had a long and detailed meeting,” Schumer said. “We discussed all of the major outstanding issues. We made some progress, but we still have a good number is disagreements — but discussions will continue.  

Mr. Trump, however, had a more optimistic view of the meeting, describing it as “excellent.”

Schumer did not indicate whether he thought they could iron out their differences by midnight. But Sen. John Cornyn, R-Texas, told reporters he expected a vote on the short-term spending bill late afternoon or early evening. Friday afternoon, White House Director of Legislative Affairs Marc Short said he was more optimistic than he had been earlier that there would be a deal. 

Sen. Joe Donnelly, D-Indiana, announced Friday afternoon he would vote yes on the bill, as did Sen. Joe Manchin, D-West Virginia, and Sen. Heidi Heitkamp, D-North Dakota. 

Meanwhile, the executive branch is laying out plans for the shutdown. 

A senior White House official on a conference call Friday night said the president could still travel to Davos, Switzerland, on Air Force One in the event of the shutdown, because funding for such travel is at his discretion. Mr. Trump had been scheduled to leave Washington for Mar-a-Lago for the weekend on Friday, but the White House canceled his scheduled departure.

The Department of Health and Human Services (HHS) said it would extend the declaration of a public health emergency for the opioid crisis. The initial declaration was to expire on Wednesday.

Mulvaney sent a memo of frequently asked questions and answers regarding what to do in a shutdown to department and agency heads. 

Environmental Protection Agency (EPA) chief Scott Pruitt issued a memo to employees stating the agency has enough funding for now, and directing employees to come into work next week, no matter what happens. 

Capitol Lounge, a favorite spot for Capitol Hill staffers, began advertising drink specials starting at 12:01 a.m. Saturday, including, “To Flake or not to Flake,” and “Have you ever met a Haitian?” 

Shortly before Schumer arrived at the White House, Mulvaney was framing any possible shutdown as a “Schumer shutdown,” complaining that Senate Democrats “are opposing a bill that they don’t oppose — they’re for clean CRs; they’re for the extension to the CHIP program.” 

The House passed the bill, known as a continuing resolution (CR), in a 230-197 vote. Afterward, Speaker Paul Ryan, R-Wisconsin, said he was urging Senate Minority Leader Chuck Schumer, D-New York, not to shut down the government.

“The only people standing in the way of keeping the government open are Senate Democrats,” Ryan said.

If lawmakers don’t extend funding by Friday night, the government will shut down early Saturday. It would be the first government shutdown since 2013. Mr. Trump tweeted about the possibility Friday morning.

This marks the fourth short-term spending bill Congress has had on its plate since September. Democrats, however, remain largely opposed to the measure because they want it tied to a larger immigration deal over the Deferred Action for Childhood Arrivals (DACA) program and border security.

The CR includes a six-year reauthorization of the Children’s Health Insurance Program (CHIP) and delays on three Obamacare taxes. Shortly before the vote, the House Freedom Caucus said a majority of its members had voted to approve the measure, making passage more certain.

Mr. Trump and White House Chief of Staff John Kelly were making phone calls late last night ahead of the looming shutdown, said a senior administration official, who declined to name who they were calling. The official said the administration was banking on a less than 50 percent chance of a shutdown.

The government last shut down in October 2013 for 16 days after Sen. Ted Cruz, R-Texas, led an unsuccessful effort to defund Obamacare. Republicans went on to retake control of the Senate in the 2014 midterm elections. It’s unclear how a government shutdown would affect either party in this year’s midterm elections in November. 

CBS News’ Rebecca Shabad, Kathryn Watson, Jacqueline Alemany and Rebecca Kaplan contributed to this report.