Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE criticized Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE's record on gun control Sunday, tying him to the recent massacre in Charleston and the National Rifle Association.

"He voted for what we call the 'Charleston loophole,' " Clinton said at Sunday night's debate, referring to a provision that gun control advocates say would have prevented the suspect in the massacre that killed nine people in a historic black church from obtaining a gun.

"He has voted with the NRA, with the gun lobby, numerous times," Clinton said of Sanders, saying that he had also voted against gun violence research that could have saved lives.

Clinton said she was glad Sanders had reversed his position on the liability of gun manufacturers — done the day before the debate. In 2005, he voted for a bill that gave gun manufacturers legal immunity.

Sanders struggled to return Clinton's attacks, pointing out that he had a D-minus record with the NRA. He said in light of this record with the NRA, her attacks were "disingenuous."

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