Obstruction of justice on Trump is obvious.
He fired Comey a few days after he publicly announced that he was investigating Tramp's campaign for collusion with the Russians. Then, a few days after that admitted on national television that the investigation was the reason he fired him. There was the meeting in the oval office with Russian dignitaries where he stated that the firing of Comey took the pressure of the investigation off him. Comey claims that in personal meetings that Trump asked him lay off the investigation of Flynn, and he asked him for a pledge of loyalty. We have the recent reports that he is personally interviewing candidates for US attorneys which is unprecedented.
The reason that I bring this up is that we have a situation on the Korean peninsula that could explode, and we have a US President that is considered by many to be unstable. I am thinking that possibly that people from the intelligence communities may have gone to Mueller and stated that if you have anything on Trump please indite him now.