I would stay out of it if possible, if I were in Trump’s shoes, because people will only be reminded that McCarthy was another of Trump’s less than optimal personnel choices.
Trump does need to stay out of it, at least publicly, but my take is a little different. If you’re playing the long game, which I believe Trump is, you’ve got to figure out how to get from point A to point B. Just because Trump endorsed McCarthy, back in January, doesn’t mean he viewed it as anything other than a temporary alliance.
Just because you choose someone to be your starting pitcher doesn’t mean that you have to, or even intend to keep him in the game all nine innings.