Considering that the NSA has it “all”, I think treason might be quite easy to prove, actually.
War Crimes too. Might be proof of that - Gaddafi’s sarin gas was used for the attack in Syria to be blamed on Assad. That was supposed to be Obama’s red line to bomb Syria.
However, IIRC, a lab in UK identified it and Sy Hersch reported it before that could happen, so Obama didn’t bomb at that time. That also may be one of the reason’s for the “alleged hit” on Ambassador Stevens.