Former President Donald Trump reportedly will not sign a loyalty pledge to support the eventual Republican nominee because he says there are already rivals in the race he knows he will not back.

“Why would I sign it?” Trump said during an interview on Newsmax, referring to the loyalty pledge, which is a prerequisite for participating in the first debate later this month. “I can name three or four people that I wouldn’t support for president. So right there, there’s a problem.”

Trump declined to name the candidates he was referring to, saying, “There’s no reason to insult them.”

He did have praise for Sen. Tim Scott (R-SC), who Trump said “has been very nice,” and businessman Vivek Ramaswamy, whom Trump said “has been very, very nice.”

Trump pointed to precedents for candidates far ahead in polls who declined to debate their rivals, mentioning former Presidents Ronald Reagan and Richard Nixon as examples. Both of them strategically skipped debates in the party primary and against their general election opponent.

When asked about rivals Chris Christie and former Vice President Mike Pence saying he is avoiding the debate stage because he may not have the guts, Trump responded, “That’s what people will say. … I did CNN Town Hall. That was about as hostile as you can do. I hear I did very well. I did so well that they fired the head of CNN over that debate,” per Newsmax.

Trump’s stance on the pledge prompted criticism from Georgia Gov. Brian Kemp, who said the importance of defeating President Biden should outweigh any intra-party differences.

“Every Republican running for President would be better than Joe Biden. Any candidate who does not commit to supporting the eventual nominee is putting themselves ahead of the future of our country. 2024 is too important for political games,” Kemp posted on Twitter.

Pence himself was questioned by Chuck Todd on Meet the Press about his commitment to the pledge since it could bind him to support Trump should he win the nomination. Pence did not directly address the issue of supporting Trump but instead said he was trying to meet the criteria for inclusion in the debate.

“Well, Chuck, what I’ve said is I’m happy to meet the criteria for the upcoming Republican presidential debates.”

Notably, Pence has not officially signed the loyalty pledge himself.