Senior Aide Blames Donald Trump for Debate Performance

The aide told ABC News that Trump's debate failures stem from "more of a lack of execution than preparation" and that Trump "lost his nerve."
3:12 | 09/29/16

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Transcript for Senior Aide Blames Donald Trump for Debate Performance
and more fallout from that big debate. Donald Trump still claiming victory even as sources in his own campaign tell ABC news he's to blame for what went wrong Monday night. ABC's Tom llamas is at trump headquarters. Pretty extraordinary finger-pointing getting criticized by his own staff. Reporter: This is a blame game like we've never seen with the trump campaign and it comes at a time that Hillary Clinton is launching a full frontal assault. She was campaigning with senator Bernie sanders yesterday. Michelle Obama out by herself hitting trump hard and the republican nominee staying busy but now dealing with this debate fallout. This morning, trouble inside the trump campaign. Finger-pointing at the highest levels about trump's rocky debate. In an explosive admission, a senior aide telling ABC news, the lion's share of the plane rests with one person, Donald Trump. That aide saying, quote, trump's debate failures stem from more a lack of execution than preparation. And he left a lot of things on the table. He pulled his punches, lost his nerve. Publicly trump has claimed victory citing unscientific polls. I had a great time and I know you say the polls weren't scientific but every single poll that was taken I won the debate and some of them by a lot. Reporter: Top aides disagree including about what went wrong. Some argue he didn't prepare enough and that there were missed opportunities including not mentions benghazi, trump himself says he showed restraint at the debate when it came to bill Clinton's past affairs. I was also holding back, I didn't want to do anything to embarrass her. Reporter: But now trump is turning up the heat on Clinton. Bringing up that video outside the 9/11 memorial when Clinton almost collapsed. You see all the days off that Hillary takes. Day off, day off, day off. All those day offs and then she can't even make it to her car. Isn't it tough? Reporter: First lady Michelle Obama taking on trump in the important battleground state of Pennsylvania. The president just can't pop off or lash out irrationally. No. We need an adult in the white house. Reporter: Urging people to get out and vote for Hillary Clinton. Who spent 11 hours testifying before a congressional committee. Can I get an amen. Hillary is tough. Reporter: Now, back to the debate prep for a moment. So that first debate, Rudy Jude Annie played a major role in it. Aides say they'll bring governor Chris Christie to help out with the second debate. Okay, Tom, while I have you "Newsweek" out a few minutes ago with a brand-new cover story talking about how Donald Trump and his companies broke the Cuba embargo by funneling money through a consulting firm. Pretty exclusive charge right there. What is the trump campaign saying about it? Reporter: Right now the trump campaign has no comment but that investigation alleges that the trump corporation reimbursed consultants to go into communist Cuba and explore casino opportunities. The magazine claims that business undertaking by itself violated the embargo but the big contradiction here is that trump then and now says he would never do business with a Castro regime.

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

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