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2nd migrant child dies in US custody

02:54

U.S. Customs and Border Protection officials say an 8-year-old boy from Guatemala died on Christmas Eve while under their care. Now, medical checks are being ordered for all children in custody. Meanwhile, President Trump doubled down on calls for a border “wall” or “fence,” and there are new details about the departure of Defense Secretary Jim Mattis. NBC’s Hallie Jackson reports.