The White House had invited congressional leaders to hear the briefing over a pair of meetings earlier this week, but House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer interrupted the presentation to instead attempt to engage President Donald Trump in negotiations to end the shutdown.The administration is expected to prepare a budget sheet for Sunday's meeting outlining their requests for border security measures, according to one congressional aide. That meant few specifics were actually discussed, as Democratic staffers repeatedly pushed the Administration to reopen the federal government and negotiate differences over the border after the shutdown ends.
Democrats have signaled they could accept a deal that precluded a concrete wall but provided funding for a steel barrier.
"While President Trump threatens to keep the government shut down for "years", Democrats are taking immediate further action to re-open government, so that we can meet the needs of the American people, protect our borders and respect our workers", Ms Pelosi said.
Security officers at United States airports have reportedly been calling in sick in droves since the shutdown began and their paycheques stopped rolling in. "Second meeting set for tomorrow", Trump said on Twitter. Pelosi said that she has a "generational" reaction to that language and wouldn't use it, but that she won't censor her colleagues.
Trump said his campaign did not collude with Russian Federation.
The standoff - which has heavily affected national parks and other operations and threatens to halt payments as varied as food stamps and tax refunds - has made Trump's unrealised wall the linchpin of his presidency as he seeks to make good on a signature campaign promise.
Mulvaney said he had concluded that Democrats "think they are winning this battle politically and they're vehement because they think the president is paying a price politically".More news: Ukrainian Orthodox Church breaks away from Russian influence
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Mr Trump is demanding that any funding to keep the federal government operational also include $5.6 billion to begin building a $23 billion a wall along the U.S. border with Mexico.
White House press secretary Sarah Huckabee Sanders said on Friday that the only reason Democrats want to "come after" President TrumpDonald John TrumpBiden on Trump's claim former presidents wanted to build wall: "Come on" Trump seizes on ex-NYT editor Jill Abramson's criticism of paper GOP strategist Ed Rollins refers to Ocasio-Cortez as "the little girl" MORE is because "they know they can't beat him".
US Representative-elect Rashida Tlaib (D-MI) reacts to a good number during an office lottery for new members of Congress on Capitol Hill November 30, 2018 in Washington, DC.
Mr Mulvaney told NBC's Meet the Press on Sunday that he thought the controversy was "going to drag on a lot longer".
Democrats said the White House did not budge on the president's demand for the wall money. The president tweeted on December 18 that "we are not building a Concrete Wall, we are building artistically designed steel slats, so that you can easily see through it".
Pelosi, who took over as House speaker this week following Democratic victories at mid-term elections in November, has said Trump's proposed wall is "immoral" and a "waste of money". "I am in the White House ready to go, where are the Dems?" "All they have to do is approve REAL Border Security (including a Wall), something which everyone, other than drug dealers, human traffickers and criminals, want very badly!"