He is letting the DOJ do what it does, and that might turn out to be disappointing. Hillary and Obama have always put several layers of people bewtween themselves and their crimes. It would take an aggressive investigator+prosecutor to break through.
Trump needs to clean up the “deep state” which includes the FBI and our whole intelligence community - then let them do what they do best - go after the REAL bad guys. Don’t need an extra-constitutional, conflicted-interest, convoluted “special prosecutor” to do that. Clean up the FBI and then have at it.