What's really striking to me is Trump's respect for the Constitution, the law and the judicial system. Sure the press harps upon his public criticism of the ruling on the travel ban, a ruling that was so obviously incorrect.
But Trump is determined to restore a republic ruled by law, after that was trashed by Obama for political purposes. The people who constantly criticize Sessions seem to be unaware that two half-republics do not make a whole republic. Sessions must make his cases within the law otherwise we don't have the rule of law.
In Hillary's case her underlings stripped the classified markings from email (or typed in without markings). They wiped the server, they destroyed the blackberries, etc. They were all given immunity by Comey. Without their testimony there is no easy case against Hillary.
Donald Trump will never let people screw with him, and he has a very long memory.
He has an awful lot of cards to play here. Since the stories about the NSA/CIA surveillance and unmasking first broke about nine months ago I have had a wild theory in my mind about what has been going on since then. I won't post it here because it's totally outlandish and flies in the face of all the "conventional wisdom" we've seen on the subject from conservative quarters. But I've been right on about 90% of the things I've speculated about this story since January, and the other 10% may simply be too difficult to confirm because of the nature of the process and the people involved.
One thing I'll leave out there is this: Robert Mueller is not operating from a position of strength. In fact, he is very much on the DEFENSIVE in many ways.