Acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE said Sunday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE is "absolutely, deadly serious" about forcing Mexico to crack down on illegal immigration through gradually increasing tariffs.

"He is absolutely, deadly serious. In fact, I fully expect these tariffs to go on to at least the 5 percent level on June 10. The president is deadly serious about fixing the situation at the southern border," Mulvaney said on "Fox News Sunday."

Mick Mulvaney on the President's threat to impose tariffs on Mexico:

He is absolutely, deadly serious. I fully expect these tariffs to go on to at least the 5 percent level on June 10th the President is deadly serious about fixing the situation at the southern border. #FNS pic.twitter.com/edZNTteiEW — FoxNewsSunday (@FoxNewsSunday) June 2, 2019

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An initial round of tariffs is set at 5 percent on all Mexican imports and would gradually increase to 25 percent.

Asked what the Mexican government could do to alleviate the tariffs, Mulvaney said it could secure its border with Guatemala, through which large numbers of migrants bound for the U.S. cross, and take steps to make it safer for immigrants to stay in Mexico.

The White House “intentionally left the declaration sort of ad hoc” with “no specific target,” Mulvaney added.

Mulvaney also dismissed warnings that the tariffs would hurt Americans, saying the same “economic orthodoxy” had been invoked in reference to a round of tariffs on Chinese goods.

“American consumers will not pay the burden of these tariffs,” he said, adding that “there’s already a price” in the form of “hundreds of billion dollars” for undocumented immigrants.

He was similarly optimistic the standoff would not hurt ongoing negotiations on the U.S.-Mexico-Canada Agreement, saying that the proposed North American Free Trade Agreement replacement was a trade issue rather than an immigration issue and that the two are “not interrelated.”