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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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Brit to America: You need 'serious people' for President

Alastair Campbell, former spokesman for Tony Blair, discusses the U.S. election with Christiane Amanpour and Michael D'Antonio, a Donald Trump biographer.

Brit to America: You need 'serious people' for President

Alastair Campbell, former spokesman for Tony Blair, discusses the U.S. election with Christiane Amanpour and Michael D'Antonio, a Donald Trump biographer.