Donald Trump set for center stage on "Saturday night live" now facing new protests, Latino groups picketing the show as Bernie sanders takes tough new shots at democratic front-runner Hillary Clinton. ABC's Jon Karl is on the campaign trail in Manchester, New Hampshire, with the latest. Good morning, Jon. Reporter: Good morning, George. Donald Trump is now finally spending some of his billions on campaign ads releasing his first radio spots this morning set to air in Iowa, New Hampshire and South Carolina, but he will likely get far more attention when he takes the stage on "Saturday night live." Live from New York, it's Donald Trump. "Saturday night live" has released its first promos for trump's appearance this weekend as the show's guest host. And because of equal time rules for television, Mr. Trump can only speak for four seconds in this promo. So let me just say this, Ben Carson is a complete and total loser. Donald has promised for the whole show he is not going to brag or say he's the best at anything, right, Donald? That's right, Cecily and I'm going to do the best job anyone's ever done not saying it. Reporter: Trump, of course, is predicting the show will be huge. A lot of them are going to say it'll be one of the highest rated shows in their history. All: Donald Trump has got to go. Reporter: Overnight hispanic groups delivered a petition claiming over 500,000 signatures calling on "Snl" to dump trump over his controversial remarkses on immigration. Another person who won't be watching is rival Dr. Ben Carson. Because I think the presidency is a very serious thing and I don't like making light of it. Reporter: Trump prepares for his hosting duties he's also taking to the airwaves releasing his first campaign radio ads this morning. If the people of Iowa vote for me, you'll never be disappointed. I don't disappoint people. I produce. Together we're going to make America great again. All: Trump, trump, trump. To me it feels like a historic day. Reporter: He became the first republican candidate to file for the ballot in New Hampshire. This may be a very, very important signature or maybe not so important. We'll have to see what happens. Reporter: And nearly everywhere you go here in new Hampshire you're bound to run into a presidential candidate. George, by my count there are seven would-be presidents campaigning here in new Hampshire just this morning. You have been on the bus with Jeb bush dropping in the polls right now and taking a page from John McCain's playbook going across the straight. He's got his new boss, he's going around around the state and we see a clearly energized Jeb bush, the most energy I've seen from him since he started this campaign. I asked hip, though, about a media consultant he has hired to help him do better in the debates. This is what he said. But you've hired this media consultant to help you with debates. Yeah, I've had one meeting with the guy. I'm going to be better. What is he telling you. He's telling me to be me. He's telling me to own what I believe. You need a consultant to tell you that. Yeah, it's amazing, isn't it? Probably not. Probably not. That debate is coming up on Tuesday. Meanwhile, on the democratic side Bernie sanders really shifting gears now and going right at Hillary Clinton That's right in an interview with "Wall Street journal" he talks about her changing positions on key issues like trade and keystone pipeline saying they raise character questions and then he said this about her e-mails, those damned e-mails he talked about. He said they raise valid questions, her privause of private e-mails. I did not say end the investigation. That's silly. Let the investigation proceed unimpeded so Bernie sanders taking a. Sharper tone here against Hillary Clinton now. Even on the e-mail issue. Opening that back up. Okay, Jon Karl, thanks very much.