U.S. Customs and Border Protection agents attend operational readiness exercises at the San Ysidro port of entry on the U.S.-Mexico border, seen from Tijuana, Mexico, Thursday, Nov. 22, 2018. U.S. President Donald Trump threatened Thursday to close the U.S. border with Mexico for an undisclosed period if his administration determines Mexico has lost "control" on its side. (AP Photo/Ramon Espinosa)
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