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Trump's controversial nuclear plan draws criticism of 'arms race' strategy

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At the recent MSNBC Town Hall, Donald Trump doubled down on his comments that the U.S. should leave all nuclear options "on the table" in its fight against ISIS, including the option of using nuclear weapons in Europe and empowering other nations to use nuclear weapons against threats, prompting Democratic front-runner Hillary Clinton to say it seems that Trump is encouraging "an arms race." NBC's Andrea Mitchell reports for TODAY.