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Mulvaney: It would take 'something dramatic' for Trump not to close border

Acting White House chief of staff Mick MulvaneyMick MulvaneyMick Mulvaney 'concerned' by Giuliani role in Trump election case On The Money: Senate releases spending bills, setting up talks for December deal | McConnell pushing for 'highly targeted' COVID deal | CFPB vet who battled Trump will lead Biden plans to overhaul agency Consumer bureau vet who battled Trump will lead Biden plans to overhaul agency MORE said Sunday that it would take "something dramatic" for President TrumpDonald John TrumpBiden says GOP senators have called to congratulate him Biden: Trump attending inauguration is 'of consequence' to the country Biden says family will avoid business conflicts MORE to not shut down the U.S.-Mexico border. 

“Something dramatic,” Mulvaney said on ABC's "This Week" when asked what it would take for Trump not to follow through on his threat of shutting down the southern border entirely.

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“When Jeh Johnson said it’s a crisis, I hope people now believe us. A lot of folks in the media… Democrats didn’t believe us a month ago, two months ago, when we said what was happening at the border was a crisis: a humanitarian crisis, a security crisis,” he said.

“One hundred thousand people coming across the border this month… that is a crisis,” he added.

Trump tweeted twice last week that he could close parts of the border unless Mexico's government immediately stopped illegal crossings.

He also continued blamed Democrats for "weak immigration laws."

The comments came after Customs and Border Protection (CBP) Commissioner Kevin McAleenan said last Wednesday that immigration enforcement has reached a "breaking point."

This is not the first time Trump has threatened to close the border. He threatened in November and in December of last year to do the same.