Mulvaney said the president was "frustrated", by news coverage and Democratic celebration over the bill, which has been described as a defeat for Trump. Republicans quickly flipped the script Tuesday, with Trump, House Speaker Paul Ryan and Mulvaney talking up a $21 billion increase in defense spending and a rise in border security funding.
The statement arrived on the eve of a House vote on the measure.
But the signs of discontent were visible even from members of Trump's Cabinet.
Congress must vote to pass the spending package by May 5 to avoid a government shutdown.
"I hope the president does not seriously wish to have the consequences of a government shutdown resting squarely on his shoulders", Leahy said.
Mr. Trump's tweets came after media reports saying Democrats were the winners in the negotiations to keep the government open, which resulted in a five-month deal that would run to the end of the current fiscal year.
They're insisting that it represents a win for the administration. This money is not to be spent on the so-called deportation force and there are no cuts to federal funding for sanctuary cities-municipalities that do not prosecute undocumented immigrants for violating federal immigration laws.
I promise to rebuild our military and secure our border. "You've got a president who knows what he's doing when it comes to running the country. and I think the message that we're sending is that we are competent". "I just won't stand for it, because it's not true", he said.
And House Democratic Leader Nancy Pelosi, D-Calif. told her colleagues this week the bill "reflects significant progress defeating risky Republican riders and securing key victories for Democratic priorities".
He touted a "massive and badly needed" increase in military funding as well as additional money for border security.
Two senior administration officials said Tuesday that the White House had planned to unveil its plans to replace some existing fencing with steel walls on portions of the border with the new funding during the signing ceremony for the bill. "What a lot of people in America don't realize is appropriations bills, they take 60 votes to pass".
Mr. Mulvaney said Democrats glossed over the gains in the deal for Mr. Trump's priority of cracking down on illegal immigration. "President Trump may not like what he sees in this budget deal, but it's unsafe and irresponsible to respond by calling for a shutdown. That's a tremendous development for this president, and a huge win from a negotiating standpoint". He responded that it was Democratic lawmakers who wanted the government to close so they could "make this administration look like it couldn't function".
Later, in the White House briefing room, Mulvaney said he understood Trump's frustration, accusing Democrats of trying to "spike the football" by publicly celebrating the budget deal as a Democratic victory in an effort to make the president look bad after he negotiated in good faith.style="text-align: center;"