POTUS should get in front of the issue....and probably will. Come out and say....”I look forward to answering questions. Mueller should send them over and I will work on it when I get back to DC.”
He got in front of DACA with the show and tell with the media and he will come up with something for this too. Now Shumer has DACA CACA on his face. Announce it at the state of the union. He has taken the high road throughout the process.....which is the correct thing to do....and the most difficult given what has gone on so far.
I imagine President Trump has plans to discuss FBI corruption in the upcoming SOTU address.
This is certainly one good approach.
My thought is that Trump knows each of Mueller's missteps, including those that favored any anti-Trump efforts.
Trump should very publically and enthusiastically agree to meet Mueller, under the same conditions extended to Hillary when the FBI "interviewed" her. With a Columbo "oh, by the way, since I am the guy that can fire you, I will trade questions with you and we will do it in front of the press".