Bob Mueller is an exceptional choice for this task, IMO
Yeah. There was a thread last week after Comey was fired saying who should be appointed the new FBI director, and I suggested Mueller, or another former FBI director (maybe like Louis Freeh).
So this seems to me basically exactly what is needed - it is the perfect choice because, as the former FBI director, this basically adds an exclamation point to the fact that this is partly about upholding the independence and non-partisanship of the FBI and the concept of the rule of law more generally.
Now we just need the new FBI director to be someone of similar stature, experience, fairness, independence, and widespread respect.