Mueller was the only one who knew where all the bones were buried. He got knocked down in 2009 (headed FBI) while looking into the U1 deal by Obama and I think he wanted payback. He had to get to the inside to get the information he knew existed out. So far, he has the swamp creatures on the run. Otheres here may not agree but I believe he is working a masterful sting.
Trump is too smart, sharp and seasoned enough NOT to have spies and double agents
That sure seems like a good theory. Would be great.