GOP frontrunner Donald Trump told his campaign rally Thursday night in Harrisburg, Pa. that his supporters’ movement in the Republican Party is “the hottest thing happening.”

“The Republican Party, not known as one of the hottest things in the world, is now one of the hottest things in the world,” the real estate mogul said to his supporters during his campaign rally at the Pennsylvania Farm Show Complex & Expo Center. “It’s the hottest thing happening.”

Trump said he wants to run against “crooked Hillary Clinton” because “We’re going to beat her so badly.”

“Hillary and Bernie are down 35 percent from four years ago,” Trump said about voter turnout, adding that Republicans are up 70 percent in votes.

Trump gave a shout out to Rep. Lou Barletta (R-PA) and Rep. Tom Marino (R-PA), who he said were at the rally.

He stressed the importance of his supporters getting out and voting, saying the other side votes, but “Who the hell even knows if they’re allowed to vote?” — referencing voter fraud.

Trump said he wants Sen. Bernie Sanders (I-VT) to continue to run against Democrat frontrunner Hillary Clinton.

“I’d like him to keep going because the longer he goes the longer I’m going to like [it],” he said. “I think she’s qualified, I guess, but that doesn’t mean she’s good.”

Trump added that Clinton shouldn’t be qualified because of her poor judgment. “I want to run against crooked Hillary Clinton. We’re going to beat her so badly.”

Prior to the rally starting, the arena was about a third full, but thousands of people reportedly waited in line outside for hours and continued to fill the rows of seats even after Trump took the stage.

#Trump aide warming up crowd in #harrisburg. I'd estimate about 2-3000 people inside arena…. still MANY outside waiting to get in — Greg Argos (@GregArgosCBS3) April 21, 2016

Trump rally in Harrisburg underway while thousands still wait to get in. pic.twitter.com/qJ0YkcPkK0 — Patrick Murray (@PollsterPatrick) April 21, 2016