In this photo provided by Rep. John Yarmuth, D-Ky., Democratic members of Congress, including Rep. John Lewis, D-Ga., center, and Rep. Joe Courtney, D-Conn., left, participate in sit-in protest on the floor of the House on Capitol Hill in Washington on Wednesday, June 22, 2016 seeking a vote on gun control measures. (Rep. John Yarmuth via AP)

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