Donald Trump Digging In and Not Backing Down or Apologizing

With pressure to apologize coming from his own party, Trump still says he is not ruling out a third-party run.
3:15 | 08/10/15

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Transcript for Donald Trump Digging In and Not Backing Down or Apologizing
We turn now to Donald Trump doubling down on those controversial comments, saying there's no reason for him to apologize. His words directed towards fox News anchor megyn Kelly about what he called some women in the past. Tonight why no apology and Hillary Clinton about what trump said on megyn Kelly. Reporter: Tonight Donald Trump refusing to back down from provocative comments about fox News debate moderator, megyn Kelly. You can see there was blood coming out of here -- wherever. Reporter: Now Hillary Clinton taking him on. I know it makes TV. I think the guy went way overboard, offensive, outrageous, pick your adjective. Reporter: Trump saying he was not talking about anything appropriate. I was referring to nose, ears. Only a deviant would think of what people said. Even declaring Kelly owes him an apology for asking this. You've called women you don't like fat pigs, dogs, slobs, and disgusting animals. Only Rosie o'donnell. She asked me a very inappropriate question. She should be apologizing to me. Reporter: Though few of trump's competitors took him on during the debate, the Kelly criticism bringing an anti-trump Chor chorus. This is not who we are. There's no excuse for this. I don't think vulgarity E kwats with insight. Do we want to win? Do we want to insult 53% of all voters? Reporter: Republicans haven't won the female vote in an election since 1988. Carly fiorina tweeting, Mr. Trump, there is no excuse. Trump tweeting back, I just realized that if you listen to Carly fiorina for more than ten minutes straight, you develop a massive headache. Trump is back on the campaign trial tomorrow night and then he heads to New Hampshire and Iowa later in the week promised to are lease detailed plans on immigration reform and job creation, something he has yet to do. We do have one more question on this. Let's get right to ABC's chief white house correspondent Jonathan Karl. Jo Jon, I wanted to get back to that moment candidates were asked to raise their hand if they would not rule out running as an independent. You've talked to Donald Trump, what's he saying tonight? Reporter: Republican leaders have been pleading with trump to take a pledge that he would not run as an independent under any circumstances. There have even been suggestions that he could be kicked out of future debates if he doesn't make that promise. But I just got off the phone a short while ago with Mr. Trump. He told me that he might eventually take that pledge, but for now the threat remains. If he is not treated well by party leaders, he will not rule out running as an independent. As for the threat he could be left out of future debates, he told me he doesn't worry about that in the least. Jon Karl tonight, thank you. We turn to the extreme weather we're following here

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

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