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Trump also suggested Friday that shutting down the border with Mexico would somehow generate \"profit\" for the U.S. When asked by ABC News for any evidence or explanation of that claim, the White House did not respond.

Duke University Economics professor Craig Burnside said the White House is making bad policy decisions to win political fights.

“Nothing good will come of it, that’s for sure,” Burnside said in an email to ABC News.

Trade with Mexico in October 2018 alone was valued at more than $50 billion with nearly $40 billion of those goods crossing the border in freight trucks, according to the Bureau of Transportation Statistics.

And the San Ysidro port of entry near San Diego is the busiest international border crossing in the Western Hemisphere.

In November, when a large group of people attempted to cross and San Ysidro was ordered closed for more than six hours, the economic impact was immediately felt by surrounding businesses in San Diego.

The San Diego Chamber of Commerce reported a loss of $5.3 million, and hundreds of businesses were forced to close for the day in the immediate border area, the organization's vice president, Paola Avila, told ABC News.

“You’re talking about cutting off your arm,” Avila said. “It’s just something that’s not viable. It’s not an option.”

Commercial trade between Tijuana and San Diego is valued at $2.1 million per day, according to the San Diego Chamber of Commerce. But the impact of a closure extends to the group of more than 90,000 people who cross daily into the U.S. through San Ysidro by car or on foot. Many people commute from Tijuana to work and go to school in the U.S.

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