Map: Migrant caravan forces closure of San Ysidro Port of Entry, San Diego interstates
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<p>TIJUANA, MEXICO - NOVEMBER 22: People waiting to cross the border in vehicles watch as U.S. Customs and Border Protection (CBP) agents conduct a "large-scale operational readiness exercise", which briefly closed the border crossing, on November 22, 2018 in Tijuana, Mexico. (Photo by Mario Tama/Getty Images)</p>