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Mexico relieved of all weapons-useable nuclear material

Rachel Maddow reports exclusively the breaking news that all of Mexico's highly enriched uranium has been removed to the United States, and talks with Sarah Dickerson, National Nuclear Security Administration threat reduction director, and Anthony Wayne, U.S. Ambassador to Mexico, about the distribution of nuclear material around the world by the U.S. and how the deal was made with Mexico to take their nuclear material off their hands.