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ROCHESTER, NH - SEPTEMBER 17: Republican Presidential candidate Donald Trump speaks during a town hall event at Rochester Recreational Arena September 17, 2015 in Rochester, New Hampshire. Trump spent the day campaigning in New Hampshire following the second Republican presidential debate. (Photo by Darren McCollester/Getty Images)
ROCHESTER, NH - SEPTEMBER 17: Republican Presidential candidate Donald Trump speaks during a town hall event at Rochester Recreational Arena September 17, 2015 in Rochester, New Hampshire. Trump spent the day campaigning in New Hampshire following the second Republican presidential debate. (Photo by Darren McCollester/Getty Images)

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    Trump: I'm not obligated to defend Obama

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Trump: I'm not obligated to defend Obama

Donald Trump is stirring up controversy on Twitter after he opted not to correct a supporter's claim that President Obama is a Muslim. CNN's Victor Blackwell has more.

Trump: I'm not obligated to defend Obama

Donald Trump is stirring up controversy on Twitter after he opted not to correct a supporter's claim that President Obama is a Muslim. CNN's Victor Blackwell has more.