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Donald Trump calls for ‘extreme vetting’ of immigrants to the US

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As Hillary Clinton and Vice President Joe Biden campaign in Pennsylvania, Donald Trump is causing a new stir by calling for what he calls “extreme vetting” of prospective immigrants to the U.S. to combat Islamic extremism. Clinton holds a nine-point lead over Trump nationally in a new NBC News/SurveyMonkey poll. NBC’s Andrea Mitchell reports for TODAY. (Run time: 1:54)