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MILWAUKEE, WI - NOVEMBER 10:  Presidential candidate Donald Trump speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10:  Presidential candidate Donald Trump speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)

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    Donald Trump explains his immigration plan

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Donald Trump explains his immigration plan

GOP presidential candidate Donald Trump tells CNN's Erin Burnett how he would deport the estimated 11 million undocumented immigrants living in the U.S.

Donald Trump explains his immigration plan

GOP presidential candidate Donald Trump tells CNN's Erin Burnett how he would deport the estimated 11 million undocumented immigrants living in the U.S.