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UNITED STATES - JUNE 21: From left, Sen. Heidi Heitkamp (D-ND) Sen. Martin Heinrich (D-NM) Sen. Susan Collins (R-ME) and Sen. Kelly Ayotte (R-NH) gather in a back hallway with other senators before their press conference on gun control legislation on Tuesday, June 21, 2016. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - JUNE 21: From left, Sen. Heidi Heitkamp (D-ND) Sen. Martin Heinrich (D-NM) Sen. Susan Collins (R-ME) and Sen. Kelly Ayotte (R-NH) gather in a back hallway with other senators before their press conference on gun control legislation on Tuesday, June 21, 2016. (Photo By Bill Clark/CQ Roll Call)

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