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UNITED STATES - JULY 31: Carla L. Provost, acting chief of the U.S. Border Patrol, arrives for a Senate Judiciary Committee hearing in Hart Building titled "Oversight of Immigration Enforcement and Family Reunification Efforts," on July 31, 2018. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - JULY 31: Carla L. Provost, acting chief of the U.S. Border Patrol, arrives for a Senate Judiciary Committee hearing in Hart Building titled "Oversight of Immigration Enforcement and Family Reunification Efforts," on July 31, 2018. (Photo By Tom Williams/CQ Roll Call)

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