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UNITED STATES - JUNE 21: Sen. Susan Collins (R-ME) speaks during the press conference on bipartisan gun control legislation on Tuesday, June 21, 2016. . Behind Sen. Collins from left are Sen. Bill Nelson (D-FL) Sen. Tim Kaine (D-VA) Sen. Lindsey Graham (R-SC) and Sen. Kelly Ayotte (R-NH). (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - JUNE 21: Sen. Susan Collins (R-ME) speaks during the press conference on bipartisan gun control legislation on Tuesday, June 21, 2016. . Behind Sen. Collins from left are Sen. Bill Nelson (D-FL) Sen. Tim Kaine (D-VA) Sen. Lindsey Graham (R-SC) and Sen. Kelly Ayotte (R-NH). (Photo By Bill Clark/CQ Roll Call)

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