The Office of Management and Budget held a conference call with federal agencies last week to discuss the possibility of a partial government shutdown.

But a Trump administration official said it was a routine call that happens every time funding is about to run out and said there is no reason to think the government will shut down after Dec. 8, when funding expires.

"OMB guidance requires that we convene a call with agencies one week prior to the expiration of appropriations, regardless of whether the enactment of appropriations appears imminent," an OMB spokesman said Wednesday. "There is no reason why a lapse in funding needs to occur."

The spokesman added that "prudent management requires that agencies be prepared for the possibility of a lapse."

The spokesman said OMB has held these sorts of calls just before federal appropriations lapse since 2013.

House Republicans were working this week to pass a short-term spending bill to keep the federal government open for another two weeks, through Dec. 22. Without a bill, federal funding will expire at the end of Friday and the government would have to partially shut down and survive only on funds available in the treasury.

The House and Senate are expected to easily pass a bill by the end of this week to keep the government operating.

But Wednesday morning, President Trump warned that a shutdown "could happen," in part because Democrats aren't willing to compromise on a longer-term funding bill.

"The Democrats are really looking at something that is very dangerous for our country," he said. "They are looking at shutting down. They want to have illegal immigrants ... pouring into our country, bringing with them tremendous amounts of crime."

Republicans are hoping to include border wall funding in a final spending bill for fiscal year 2018, something Democrats reject.