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NEW YORK, NY - SEPTEMBER 03:  GOP presidential front-runner Donald Trump speaks at a news conference in Manhattan after he signed a pledge Thursday to support the Republican nominee in the 2016 general election, ruling out a third-party or independent run on September 3, 2015 in New York City. Trump made the announcement following a meeting with  Republican National Committee chairman Reince Priebus. Trump stressed repeatedly in the news conference that he is leading in all national polls.  (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - SEPTEMBER 03:  GOP presidential front-runner Donald Trump speaks at a news conference in Manhattan after he signed a pledge Thursday to support the Republican nominee in the 2016 general election, ruling out a third-party or independent run on September 3, 2015 in New York City. Trump made the announcement following a meeting with  Republican National Committee chairman Reince Priebus. Trump stressed repeatedly in the news conference that he is leading in all national polls.  (Photo by Spencer Platt/Getty Images)

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    Trump stumbles over foreign policy questions

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Trump stumbles over foreign policy questions

Republican presidential candidate Donald Trump stumbled during questions about foreign policy and he says the interviewer is to blame. CNN's Dana Bash reports.

Trump stumbles over foreign policy questions

Republican presidential candidate Donald Trump stumbled during questions about foreign policy and he says the interviewer is to blame. CNN's Dana Bash reports.