Transcript for Trump kicks off 2020 with rally, new slogan
president trump officially kicking off his re-election campaign in the key battleground state of Florida. A full house there. Thousands on hand amid new polls that show some Democrats running including Joe Biden holding quite a lead in Florida in head-to-head match-ups with the president. Of course, plenty could change and Jonathan Karl is live in Florida, it would seem, is a must win if he wants a second Reporter: No question about that, David. The president kicked off his campaign here with a huge enthusiastic crowd, a new slogan and a speech that sounded like it could have been given during the last campaign. The president made it official at a raucous rally in Orlando. I stand before you to officially launch my campaign for a second term as president of the United States. Reporter: He has a new slogan -- Keep America great. Reporter: But he's fighting old battles. He spent so much time attacking Hillary Clinton -- 33,000 emails deleted. Think of it. Reporter: It seemed for awhile as if he were getting ready to run against her again. As the speech went on, the president made dark, unfounded attacks against Democrats. Our radical Democrat opponents are driven by hatred, prejudice and rage. They want to destroy you and they want to destroy our country as we know it. Reporter: He fired up the crowd with the signature promise from his last campaign -- It's moving along rapidly. It's beautiful. I changed the design. It's stronger, bigger, better and cheaper. Reporter: In fact, there have been only 45 miles of wall built so far. All of it in areas that already had a barrier but as the president runs for re-election he has something he didn't have the last time. An unquestionably strong economy to run on. And together we will make America wealthy again. Reporter: One thing striking about this speech was how little he talked about his potential 2020 rivals and only mentioned two by name, Bernie Sanders and Joe Biden and, David, both of those references were short and in passing. The other striking thing, Jon Karl is already out there covering the race for 2020 all over again. Here we go, Jon. Thanks so much. Reporter: You got it. It's going to be a long one.
This transcript has been automatically generated and may not be 100% accurate.