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Image #: 39177601    U.S. presidential hopeful Donald Trump holds up a signed pledge during a press availability at Trump Tower in Manhattan, New York September 3, 2015. Trump is expected on Thursday to sign a pledge not to run as an independent candidate if he loses the Republican Party nomination, a party official said, despite earlier refusals to rule out a third-party bid.  REUTERS/Lucas Jackson /LANDOV        TPX IMAGES OF THE DAY
Image #: 39177601    U.S. presidential hopeful Donald Trump holds up a signed pledge during a press availability at Trump Tower in Manhattan, New York September 3, 2015. Trump is expected on Thursday to sign a pledge not to run as an independent candidate if he loses the Republican Party nomination, a party official said, despite earlier refusals to rule out a third-party bid.  REUTERS/Lucas Jackson /LANDOV        TPX IMAGES OF THE DAY

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    Trump signs Republican Loyalty Pledge

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Trump signs Republican Loyalty Pledge

Republican presidential candidate Donald Trump signed a pledge not to run as a third party candidate... what does this mean for the 2016 race?

Trump signs Republican Loyalty Pledge

Republican presidential candidate Donald Trump signed a pledge not to run as a third party candidate... what does this mean for the 2016 race?