Jeb Bush and Donald Trump get down and dirty.
JEB BUSH: This is another example of the lack of seriousness. Look, this is, this is troubling because we're at war. They've declared war on us and we need to have a serious strategy to destroy ISIS. But the idea that that is a solution to this is just is just crazy. It makes no sense to suggest this. Look, two months ago donald trump said that ISIS was not our fight. Just two months ago. He said that hillary clinton would be a great negotiator with Iran. And he gets his foreign policy experience from "The Shows." That is not a serious kind of candidate. We need someone that thinks this through. That can lead our country to safety and security...
DONALD TRUMP: Look, the problem is we need toughness. Honestly. I think Jeb is a very nice person. He's a very nice person, but we need tough people and we need toughness and we need intelligence and we need tough. Jeb said when they come across the southern border they come as an act of love--
BUSH: You said on September 30th that ISIS was not a factor--
TRUMP: Are you talking or am I talking?
BUSH: I'm talking right now.
TRUMP: You can go back, you're not talking.
BUSH: Sept. 30, you said--
TRUMP: You interrupted me. Are you going to apologize, Jeb? No. Am I allowed to finish? Excuse me, am I allowed to finish?
BLITZER: Go ahead, Mr. Trump.
BUSH: A little of your own medicine.
BLITZER: Governor Bush, please. One at a time.
TRUMP: Look, look, look. We need a toughness. We need strength. We're not respected, you know, as a nation any more. We don't have that level of respect that we need. And if we don't get it back fast, we're just going to go weaker, weaker and just disintegrate. And we can't allow that to happen. We need strength. We don't have it. When jeb comes out and he talks about the border and i saw it and i was witness to it and so was everyone else and i was standing there, they come across as an act of love. He's saying the same thing right now with radical Islam. And we can't have that in our country. It just won't work. We need strength.
BUSH: Donald, you're not going to be able to insult your way to the presidency. That's not going to happen. And I do have the strength. Leadership, leadership is not, leadership is not about attacking people and discourage discouraging people. Leadership is about creating a serious strategy to deal with the threat of our time...
TRUMP: With Jeb's attitude, we will never be great again. that I can tell you. We will never be great, again.