President Biden says Vice President Kamala Harris will lead the administration's diplomatic effort to stem the flow of migrants to the southern border as U.S. officials are coping with a record of more than 16,000 unaccompanied migrant children. CBS News immigration reporter Camilo Montoya-Galvez joins CBSN's "Red & Blue" anchor Elaine Quijano with more on a visit lawmakers made to a migrant holding facility in Texas, and details about new shelters being planned.
