The Senate has no authority to put a private citizen on trial. None.
Since all branches of government have now thrown out the Constitution, I guess anything goes. The Senate could spend their full time as a reconstituted Star Chamber. Indict, try, punish political opponents all in secret, and without allowing any defense.
That’s what I don’t get. You can’t even call this a trial. The Senate can’t try a private citizen. This is nothing more than a communist show trial.