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OSKALOOSA, IA - JULY 25: Republican presidential hopeful businessman Donald Trump speaks to the press following a rally on July 25, 2015 in Oskaloosa, Iowa. During his last visit to the state Trump sparked controversy when he said Senator John McCain (R-AZ), a former POW, was not a war hero. (Photo by Scott Olson/Getty Images)
OSKALOOSA, IA - JULY 25: Republican presidential hopeful businessman Donald Trump speaks to the press following a rally on July 25, 2015 in Oskaloosa, Iowa. During his last visit to the state Trump sparked controversy when he said Senator John McCain (R-AZ), a former POW, was not a war hero. (Photo by Scott Olson/Getty Images)

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    Donald Trump leads GOP field

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Donald Trump leads GOP field

In the first national telephone poll since Donald Trump made comments about Senator John McCain's military service, he leads the race for the GOP nomination.

Donald Trump leads GOP field

In the first national telephone poll since Donald Trump made comments about Senator John McCain's military service, he leads the race for the GOP nomination.