Michael Bloomberg, who has spent years bankrolling the gun-control movement, fumbled facts and made muddled claims on how gun laws work while laying out his campaign's gun-control plan on Thursday. Bloomberg appeared to misunderstand what the FBI's firearms background check system does, seemed to make up a new "loophole" in federal gun laws, and made questionable claims about gun use among young people during a campaign speech in Aurora, Colo.

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