Donald Trump Vows Not to Run as Third-Party Candidate

The controversial Republican candidate signed a loyalty pledge saying he will not turn his back on the party if he loses the nomination.
2:17 | 09/04/15

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Transcript for Donald Trump Vows Not to Run as Third-Party Candidate
A new move from Donald Trump reversing course now signed a loyalty pledge to the republican party ruling out an independent run for president. Prompting to support the gop nominee even if it's not him. ABC's Tom llamas has been tracking the race and joins us now. Reporter: Good morning. All 17 republican candidates have now signed that pledge. Trump says there's no scenario where he leaves the republican party to go rogue. This as an interview with a conservative talk radio show host didn't go exactly as planned. This morning, Donald Trump's going from this -- I will not make the pledge at this time. Okay. Reporter: -- To this. So I will be totally pledging my allegiance to the republican party and the conservative principles for which it stands. Reporter:mising thought to run as a third party candidate holding up a sign pledged to the gop. Rival Jeb bush mocking the whole affair tweeting out this photo, voted republican since 1972 and signing it. But this was no joke for the chairman of the republican party. Reince priebus meeting with trump privately. He did what he had to do and I did what I had to do as chairman of the party and my job is to put the party in a better position and when we get a nominee. Reporter: Meanwhile, overnight Donald Trump showing he may need a foreign policy coach if he wants to make it to the white house. Are you familiar with general suleimani? Yes, I -- go ahead, give me a little -- He runs the quds forces. Yes, okay, right. Do you expect. And I think the kurds have been by the way horribly mistreated by us. Not the kurds, the quds forces. Yes. Reporter: Republican front-runner stumble you through an interview on Thursday. I don't believe coming up Monday on the eastt.co as Ksth. An He T race for president now. Your voice, your vote. And vice president Biden speaking out publicly for first time last night about a possible run for president. Jon Karl covering that from the white house. You can see from Biden that this is above all an emotional decision. Reporter: It sure is, George. Joe Biden sounds like he really wants to run for president but he's unsure whether or not his family can handle it so soon after the death of his son beau. In an appearance last night at

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

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