When he first said this a week ago I thought he was joking. Now I think he may be looking for an excuse to get out of doing the CNN debate. Watching Trump's reaction after the Fox debate you can clearly see he didn't enjoy it. He really didn't do that well but he 'won' the post debate by dominating the news with his Fox/Kelly spat. Can he pull that trick off again? As frontrunner he has more to lose so skipping may seem like a good idea.
But will be remain viable if he doesn't attend debates?
Will the debate be viable?