Jeb Bush Turns Focus to Combating Donald Trump

The former Florida governor goes on the offensive by releasing a new video targeting the real estate mogul.
4:50 | 10/19/15

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Transcript for Jeb Bush Turns Focus to Combating Donald Trump
To race for president now. The Birt feud between Donald Trump and Jeb bush heating up, after trump accuses George W. Bush for not stopping the 9/11 attacks. Reporter: Jeb bush, once thought to be the clear republican front-runner now finds himself in an increasingly nasty war of words with the real front-runner, Donald Trump. He was once considered the candidate to beat. But Jeb bush is down in the polls, collecting less cash, and lashing out at Donald Trump, suggesting he's not fit to be commander in chief. He talks about things as though he's still on "The apprentice." He's noik taking the possibility of being the president of the United States seriously. Reporter: This after trump went after George W. Bush. Say what you want. The world trade center came down during his time. If you look at sandy hook -- Wait, you can't blame George bush. He was president. Don't blame him or don't blame him, but he was president. Reporter: A charge trump didn't back down from on Sunday. Jeb said we were safe with my brother. We were safe. Well, the world trade center just fell down. Am I trying to blame him? I'm not blaming anybody. The world trade center came down. Reporter: Trump sukted it wouldn't have happened on his watch because the hijackers would vice president made it into the country if he was president. What would you have done? I doubt that those people would have been in the country. ? Reporter: Over the week end, bush's campaign released a new video, ridiculing trump on national security. I'm used to, you know, dealing with killers. People that go -- let me tell you, I'm really smart guy. Reporter: The latest national poll, Jeb bush is trailing not just trump, but Carson, Cruz, and Rubio, too. Everyone when it kooms to fund-raising, which was thought to be his biggest advantage, he was outraised last quarter by the soft-spoken political new comer Dr. Ben Carson, who declined to criticize trump's remarks to George on "This week." What do you make of that? I would probably ask him pip seriously doubt that he's saying George W. Bush is to blame for it. Reporter: Bush is also fighting with Marco Rubio, who he once considered to be the future of the republican party. He now cease as his main competition to becoming the alt tern Ty to trump. Also republican in-fighting about the benghazi committee where Hillary Clinton will testify on Thursday. Reporter: That's right. She'll be there for eight hours of testimony on Thursday. The chairman of that committee, trey Gowdy is telling fellow republicans to shut up about what they're doing. He's annoyed by comments by republicans on the committee talking about how it's doing political damage to Hillary Clinton. Let's talk about the democrats now. Matt dowd is here. And of course, the big story right now, Joe Biden. Likely to make a decision within the next couple of days. In or out? You have been saying in? If you're looking for a candidate, the goldilocks candidate, authentic like Bernie sanders, and confident and experienced like Hillary Clinton, he's your person. A new poll out showing Hillary Clinton maintaining her lead. The number of democrat who is support Joe Biden and want him to get in going down. He can't become hamlet on the Delaware. I think he has the next 48, 72 hours to get in. I think he has to get in before the benghazi testimony. A plur rally now doesn't want him to get in. Meanwhile, Bernie sanders going strong. The impression by Larry David. I'm an outside person the only candidate up here who is not a billionaire. I don't have a superpac. I don't have a backpack. I carry my stuff around loose in my arms like a professor between classes. I own one pair of underwear. That's it. Some of these billionaires, they got three, four pairs. Bernie sanders loved it. He says he wants Larry David to play him out on the stump. It's a sign that sanders is breaking through and affecting the debate. Absolutely. He has this immense authenticity. He LAFD about that. He said he had more than one pair of underwear. Bernie sanders polls at 25, 26, 27%. He'll keep that. That impersonation was spot on. Now to a hack attack targeting the head of the cia. Director John Brennan's personal

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

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