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Donald Trump, presumptive Republican presidential nominee, speaks during the National Rifle Association (NRA) annual meeting in Louisville, Kentucky, U.S., on Friday, May 20, 2016. Trump, who in the past called for restrictions on certain weapons purchases, announced his a plan in September for a national right-to-carry law and called gun and magazine bans 'a total failure.' Photographer: Luke Sharrett/Bloomberg via Getty Images

Donald Trump, presumptive Republican presidential nominee, speaks during the National Rifle Association (NRA) annual meeting in Louisville, Kentucky, U.S., on Friday, May 20, 2016. Trump, who in the past called for restrictions on certain weapons purchases, announced his a plan in September for a national right-to-carry law and called gun and magazine bans 'a total failure.' Photographer: Luke Sharrett/Bloomberg via Getty Images