Republican presidential candidate Sen. Rand Paul (R-KY) said in a clip of an interview posted Friday that he thought GOP rival Donald Trump was the “worst nominee” for the Republican party.

Paul’s full interview with Newsmax TV is scheduled to air Monday at 9 p.m. ET.

Paul said that Trump would be the “largest loser of any candidate ever in the history of the country if he were our nominee.”

Paul and Trump have exchanged insults throughout their campaigns. In Paul’s interview with Newsmax, he mentioned some of Trump’s remarks.

Trump had said the immigrants were rapists and drug dealers. Trump also commented on GOP hopeful and former Hewlett-Packard CEO Carly Fiorina’s face.

“Do you think women are going to nominate some guy who judges people by their appearance and calls another candidate ugly? Do you think they’re going to nominate somebody who implies that most Hispanics are rapists and drug dealers? ‘Oh yeah there might be a few of them who are not,’” Paul said.

“You know, that kind of attitude is such and so polarizing. We’d get just swamped in a landslide.”

Paul said that he thought the majority of Republicans will “wake up” and realize Trump “would be a disaster for our party and the country” if he was nominated.

“He’s the worst nominee that we could possibly think of,” Paul continued. “And part of the reason is he’s not really a Republican. He’s recently become a Republican, but he’s been a Democrat for most of his life.”

Watch the preview of the interview with Paul:

h/t: BuzzFeed News