The border crossing near San Diego is the country’s busiest land port of entry. More than 100,000 people cross the border daily through San Diego and Tijuana, and the cities exchange more than billion a year. As special correspondent Jean Guerrero of KPBS reports, residents and the economy would face a profound change if President Trump followed through on his threats to close the border.

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More info on Trump’s threats to close border scare San Diego residents into staying home

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