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

Acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneyTrump judicial picks face rare GOP opposition Trump administration asks Supreme Court to take up challenge to consumer bureau NOAA chief praises agency scientists after statement backing up Trump tweet MORE said Sunday that it would take "something dramatic" for President TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' 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.