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Exclusive: Inside the largest migrant processing facility in the U.S.

CBS News has an exclusive look inside the growing immigration crisis. "CBS Evening News" anchor and managing editor Norah O'Donnell visited the U.S.-Mexico border and got rare access to the largest migrant processing facility in the U.S. in McAllen, Texas. O'Donnell spoke exclusively with the acting Secretary of Homeland Security, and met some of the thousands of migrant families who are caught up in the crisis.

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