Trump Says He Won’t Sign Loyalty Pledge Required for G.O.P. Debate

Former President Donald J. Trump said on Wednesday that he was unwilling to meet one of the requirements to participate in the first Republican presidential debate, refusing to sign a pledge to support the eventual nominee.

“I wouldn’t sign the pledge,” he said in an interview with the conservative outlet Newsmax. “Why would I sign a pledge? There are people on there that I wouldn’t have.”

The decision would seem to rule out the possibility of him being at the debate on Aug. 23, yet he also said that he would announce next week whether he planned to take part. Asked for comment on Thursday, the Republican National Committee, which sets the rules, referred to past comments in which its chairwoman, Ronna McDaniel, has defended the pledge and said the committee will hold everyone to it.

“I can name three or four people that I wouldn’t support for president,” Mr. Trump said in the Newsmax interview, without specifying which candidates. “So right there, there’s a problem right there.”

Mr. Trump also said in the interview that he wasn’t convinced it was worth it for him to debate given how far ahead he is in the primary. A recent New York Times/Siena College poll showed him leading the field by an enormous margin, more than 35 percentage points ahead of his nearest competitor, Gov. Ron DeSantis of Florida.

“Why would you do that when you’re leading by so much?” he asked.

Mr. Trump’s vacillation over the pledge is not new; he objected to signing the same loyalty pledge during his first campaign eight years ago. He ultimately did, but then took it back.

That history underscores that the pledge is, in practice, unenforceable. Party leaders can refuse to let a candidate debate for not signing, but they can’t force someone who does sign to actually support another nominee next year.

One of Mr. Trump’s opponents, former Gov. Chris Christie of New Jersey, has said that he will sign the pledge, but that he would not support Mr. Trump if he is the eventual nominee: “I’m going to take the pledge just as seriously as Donald Trump took it in 2016,” he told CNN.

Another opponent, former Gov. Asa Hutchinson of Arkansas, has suggested that — if he otherwise qualifies for the debate, which he hasn’t yet — he would sign based on the far-from-safe assumption that Mr. Trump won’t be the nominee and Mr. Hutchinson won’t actually be tested.