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Republican presidential hopefuls Ben Carson (L) and Donald Trump look on during the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015. Republican presidential candidates collectively turned their sights on frontrunner Donald Trump at the party's second debate, taking aim at his lack of political experience and his sometimes abrasive style. AFP PHOTO / FREDERIC J BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)
Republican presidential hopefuls Ben Carson (L) and Donald Trump look on during the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California, September 16, 2015. Republican presidential candidates collectively turned their sights on frontrunner Donald Trump at the party's second debate, taking aim at his lack of political experience and his sometimes abrasive style. AFP PHOTO / FREDERIC J BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)

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    Trump lawyer: Carson needs more vetting

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Trump lawyer: Carson needs more vetting

Michael Cohen, special counsel to presidential candidate Donald Trump, says Dr. Ben Carson's autobiography is "just the beginning" of the doctor's problems.

Trump lawyer: Carson needs more vetting

Michael Cohen, special counsel to presidential candidate Donald Trump, says Dr. Ben Carson's autobiography is "just the beginning" of the doctor's problems.