Trump Taking on Another Republican Candidate

Just days after questioning John McCain's status as a war hero, Trump gives out the cell phone number of one of his competitors.
2:00 | 07/21/15

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Transcript for Trump Taking on Another Republican Candidate
It will be more comfortable. That part we like. Thank you. Donald Trump making a new headline tonight. Already under fire for saying John McCain is not a war hero. Tonight, feuding with another republican contender, giving out his rival's private phone number on national TV. Tonight, Jon Karl with the moment that trump saying that McCain is no war hero. Reporter: Under fire for insulting John McCain, Donald Trump was at it again today. Hammering McCain's good friend, and presidential candidate, Lindsey graham. And then I watch this idiot Lindsey graham on television today and he calls me a jackass. He's a jackass! Reporter: And then he went further, actually giving graham's private cell phone number. I don't know if it's the right number. Let's try it. 202. Reporter: Still stinging, trump's comments on McCain's military's service. He's not a war hero. He's a war hero. He is a war hero. Five and half years in a Vietnamese prison camp. He's a war hero because he was captured. I like people that weren't captured. Okay? I hate to tell you. Reporter: "New York daily news yts called trump a gi joke. Pointing out while McCain was being tortured in Vietnam, trump was living the high life back home and avoiding the draft with multiple deferments. We caught up with McCain today in Washington. Is it especially galling coming from a guy who avoided the draft with so many deferments? All of this I tried to put behind me when I came home to unite America not divide it. Reporter: Trump insists he's done his part for veterans. Including serving adds grand Marshall for a veteran's parade he helped pay for in 1995. Enter Jon Karl is with us us today. The ABC news poll shows trump surging in the polls. But it's unclear if it will help trumplt or hurt him. Unclear because most of the people were before the comments on McCain. And smaller group surveyed after what he said, the report was lower. Jon Karl, thank you. We have breaking news in the

This transcript has been automatically generated and may not be 100% accurate.

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