John Kasich, Carly Fiorina and Chris Christie have all refused to sign the GOP letter proposing debate changes, their campaigns said Monday night.

"We are declining to sign the letter," Kasich spokesman Chris Schrimpf told The Daily Beast. "We're happy the group decided to agree with us to not alter the Fox debate. As the governor of Ohio he is used to answering tough questions all the time."

Schrimpf clarified that by "group," he meant all the representatives for the campaigns in attendance at the meeting. He did not respond when asked who all was in attendance.

When reached for comment, Christie's communications director Samantha Smith pointed The Daily Beast to comments Christie made on Fox & Friends this morning. "Stop complaining," Christie said. "Do me a favor, set up a stage, put podiums up there, and let's just go. Okay?"

Carly Fiorina didn't even attend the meeting on Sunday night. Deputy Campaign Manager Sarah Isgur Flores shared an email with the Daily Beast that she sent to Ben Ginsberg, the lawyer running the closed door session. Flores claims that they skipped the meeting and opted for dinner at Applebee's instead.

"Our campaign choose not to attend your closed door meeting last night," Flores wrote. "We had dinner at the Applebee's in Pella, Iowa instead.

"These debates are an important chance for voters to see conservative candidates under pressure and over time. We have consistently and successfully discussed our concerns with the networks and the voters--and not behind closed doors like the political class seems to like to do. We encourage each of the campaigns addressed here to do the same.

"As we have expressed publicly, we encourage the RNC to sanction conservative networks such as the Blaze and One America News to host and moderate a debate. We do not care whether it's 67 degrees or our green room isn't as plush as another candidate.

"Team Carly will not be signing this letter."

The letter features stipulations for future debates, including guaranteed opening and closing statements of at least 30 seconds for each candidate. It threatens that candidates will back out of debates if the demands are not met. Donald Trump similarly rejected the letter earlier today, reportedly opting to negotiate directly with the television networks in question.

Ben Carson's campaign, which was the principal architect of the meeting, has not responded to a request for comment from The Daily Beast.

—Gideon Resnick