Acting White House Chief of Staff Mick Mulvaney on Sunday announced on ABC News' This Week it would take "something dramatic" to get President Trump to change his mind about shutting down the U.S.-Mexico border. White House counselor Kellyanne Conway agreed, saying on Fox News Sunday this "certainly isn't a bluff." On Friday, Trump complained about the stream of migrants crossing the southern border and said he would shut it down, and repeated his threat Saturday on Twitter. Mexico is the United States' third-largest trading partner, with the Commerce Department reporting more than $611 billion in cross-border trade in 2018. Critics say closing down the border would only hurt American businesses and consumers and won't do anything to stop undocumented immigrants from crossing into the U.S.

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