Trump confirms he skipped debate out of cowardice (specifically fear of Christie) in Tucker Carlson interview:
https://abc7chicago.com/donald-trump-tucker-carlson-interview-twitter/13692275/"Do I sit there for an hour or two hours, whatever it's going to be, and get harassed by people that shouldn't even be running for president?" Trump said in the 46-minute interview. "Should I be doing that at a network that isn't particularly friendly to me?".
Trump attacked some of his rivals early, calling former Arkansas Gov. Asa Hutchinson "nasty," and cited him as an example of someone who shouldn't be on the debate stage, along with former New Jersey Gov. Chris Christie. Both Christie and Hutchinson have been critical of Trump and said he shouldn't be running for president.
"I'm going to have all these people screaming at me, shouting questions at me, all of which I love answering, I love doing. But it doesn't make sense to do them so I'm taking a pass," Trump said.
https://thehill.com/homenews/campaign/4168033-trump-lashes-out-at-fox-news-bill-barr-chris-christie-in-tucker-carlson-interview-highlights/“He runs solely on the basis of ‘Let’s get Trump,’” the former president said. “He’s like a savage maniac. He’s like a lunatic. And that’s all he talks about. His poll numbers are very, very low.”
All the tough-guy talk from Trump, and he's afraid to stand on a stage with two former governors and take questions from Fox News. The only thing more pathetic and cowardly than Donald Trump are his supporters.