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Right now, people on the No-Fly list can walk into a store and buy a gun. That is insane. If you're too dangerous to board a plane, you're too dangerous, by definition, to buy a gun, and so I'm calling on Congress to close this loophole, now. We may not be able to prevent every tragedy, but -- at a bare minimum -- we shouldn't be making it so easy for potential terrorists or criminals to get their hands on a gun that they could use against Americans.