TC touches on it. First off in the espionage act it quite clearly states that if you are in possession of classified documents you are guilty of a felony. While Mueller gave HC a pass because he didn't think (but didn't know) she intended to use the information that is no excuse as the Act specifically states intent is not to be considered. Trump an the other hand, as POTUS can change the classification of most any documents on his say so alone. I believe he did so. So there it is in a nutshell. HC committed a crime and got let off because she is a Dem, Trump doesn't get let of because he is a Rep.