House Oversight and Reform Committee Chairman Elijah Cummings, D-Md., is shown in this file photo from Wednesday, June 12, 2019. Mr. Cummings on July 31, 2019 sent a letter asking Homeland Security to reveal when officials learned about secret Facebook groups frequented by Border Patrol agents where offensive messages were exchanged. (AP Photo/J. Scott Applewhite, file) **FILE**
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