Transcript for Donald Trump Responds to Hillary Clinton's ISIS Recruitment Claims
All the fallout from the democratic debate Saturday. It's triggered a new war. He's calling her a liar. She's not backing down. Reporter: There are now serious questions about whether such a video even exists. What is certain, one of the main targets during that debate wasn't anywhere near that stage. This morning, Hillary Clinton on the defensive, after going on the offensive against Donald Trump. He is becoming Isis' best recruiter. They are going to people, showing videos of Donald Trump insulting Islam and muslims in order to recruit more radical jihadists. Reporter: That claim made during Saturday's debate. There is no evidence to back it up. Clinton's campaign unable to prove such a video exists. He's being used in social media. By Isis. As propaganda. She didn't have a particular video in mind. Reporter: Trump firing back on Twitter saying Clinton lied and doubling down. She just made it up. She made it up. It was a sound bite. Reporter: On the debate stage, one big elephant in the room. Yes, I apologize. Reporter: Bernie sanders apologizing for the breach of Clinton's private voter database. This is not the type of campaign that we run. I very much appreciate that comment. Reporter: Clinton center stage and noticeably absent when a trip to the bathroom during a commercial break ran a little long. Sorry. Reporter: The laughter spilling over to another stage Saturday. Reporter: On "Snl" this year's Hillary joined by ghosts of Christmas past. Aren't you worried about the republicans? Who is their front-runner? Just tell me. Donald Trump. We're gone ma be president! I know! Get back to 2008 and send a bunch of e-mail. No. Reporter: It was so good the campaign trail offering -- we're cracking up here in the studio. Clinton taking a lot of heat this morning for the claim about Isis using Donald Trump in recruitment videos. We asked the white house and the national security council about those xlclaims. Both unaware of videos. Hillary Clinton taking heat from that statement. She comes out of the the debate in a good position. A huge lead nationally. Bernie sanders at his best in early states. Hillary Clinton a solid lead, double digit lead outside the margin of error. In New Hampshire, Bernie sanders consistently the front-runner. In the most recent polls, his lead has shrunk. The Boston herald poll, up by just two points compared to a much bigger lead back in August. Inside the margin of error. It's a dead heat even in new Hampshire right now. Donald Trump pounced on the Clinton comments yesterday. He was front and center in the debate Saturday night. He absolutely was. In fact, if you take a look at the extraordinary graphic, of how many times the various continues can candidates were mentioned, this graphic is incorrect. He was mentioned nine time. All the other candidates not mentioned a single time. Hillary Clinton taking heat for comments on Isis. Absolutely. She said during the debate we are finally where we need to be when it comes to Isis. Republicans are pouncing on that. Jeb bush went after her during the debate. He's put out a video looking at the things that is happened. San Bernardino, Paris, saying no way are we where we need to be. A bomb scare on board a
This transcript has been automatically generated and may not be 100% accurate.