Some parks shuttered in budget impasse.

WASHINGTON — The federal government was expected to remain partially shut down past Christmas as the standoff deepened Saturday over President Trump’s demand for funds to build a border wall with Mexico.

With Trump’s insistence on $5 billion for the wall and negotiations with Democrats in Congress far from a breakthrough, even a temporary measure to keep the government running while talks continued seemed out of reach until the Senate returns for a full session Thursday.

From coast to coast, the first day of the shutdown played out in uneven ways. The Statue of Liberty was still open for tours, thanks to funding from New York state, and the U.S. Post Office was still delivering mail, as an independent agency. But visitors arriving at Carlsbad Caverns National Park in New Mexico could check out only the surface, not the underground cavern that is the park’s main attraction.

The disruption affected many government operations and the routines of 800,000 federal employees. Roughly 420,000 workers were deemed essential and were expected to work unpaid. An additional 380,000 were to be furloughed, meaning they will stay home without pay.

No one knew how long the closures would last. Unlike other shutdowns, this one seemed to lack urgency, coming during the long holiday weekend after Trump had already declared Monday, Christmas Eve, a federal holiday. Rather than work around the clock to try to end the shutdown, as they had done in the past, the leaders of the House and the Senate effectively closed up shop. But they didn’t rule out action if a deal were struck.

“Listen, anything can happen,” Senate Majority Leader Mitch McConnell told reporters after he closed the Senate’s rare Saturday session hours after it opened.

But after ushering Vice President Mike Pence through the Capitol for another round of negotiations, GOP Sen. Richard Shelby of Alabama, said a quick end to the shutdown was “not probable.”

At the White House, Trump hosted a lunch Saturday with conservative lawmakers, including House Freedom Caucus chiefs Mark Meadows of North Carolina and Jim Jordan of Ohio, and several senators.

“I am in the White House, working hard,” tweeted the president, who canceled his Florida holiday getaway to his club Mar-a-Lago due to the shutdown.

Senate Democratic leader Chuck Schumer of New York met with Pence on Saturday, according to Schumer’s office. But the senator’s spokesman said they remained “very far apart” on a spending agreement.

Schumer said the “Trump shutdown” could end immediately if the president simply dropped his demand for money. “If you want to open the government, you must abandon the wall,” Schumer said.

Lisa Mascaro, Darlene Superville and Kevin Freking are Associated Press writers.