This July 26, 2018, file photo shows people lining up to cross into the United States to begin the process of applying for asylum near the San Ysidro port of entry in Tijuana, Mexico. Homeland Security's watchdog says immigration officials were not prepared to manage the consequences of its "zero tolerance" policy at the border this summer that resulted in the separation of nearly 3,000 children from parents. (AP Photo/Gregory Bull, File)
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