White House budget chief Mick Mulvaney on Sunday said President Trump is "frustrated that the process in Washington is broken" in explaining the president's call for a "good shutdown" in September to fix the "mess" in government.

"What we just did this week was fine and passable, but not ideal ... I think a good shutdown would be one that could help fix that," Mulvaney said on CBS's "Face the Nation." "It's part of the overall drain-the-swamp mentality about Washington, D.C."

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Mulvaney said this president is willing to think outside the box and do things differently.

"And if that comes to a shutdown in September, so be it," he said.

The president last week tweeted that there should be a "good shutdown."

"The reason for the plan negotiated between the Republicans and Democrats is that we need 60 votes in the Senate which are not there!" he wrote.

"We either elect more Republican Senators in 2018 or change the rules now to 51%. Our country needs a good 'shutdown' in September to fix mess!"

The president's unprecedented comments appeared to reflect frustration with the spending deal. Democrats argued they won most of the battles surrounding the bill, and several media accounts have suggested Trump and the White House were losers in the negotiations.