I don’t think it is Trump’s move yet. There are cards on Obama/Clinton’s side yet to be played out.
According to the statute on handling classified media, Clinton did clearly violate the law. According to the statute, Negligence is not an excuse.
Possible sequence to follow:
1. The AG has Clinton charged.
2. She admits guilt gets sentenced.
3. Obama commutes the sentence and pardon’s her as he leaves office.
I think that could happen in the remaining month an half. She needs to admit guilt so that real data which could be worse, doesn’t get presented in court. Once sentenced and then pardoned, she would not be able to be retried due to double jeopardy. At this point Hillary should be free and clear of the problems with her Email, probably forever.