With the Clinton, what she did was wrong not illegal. It doesn’t take a genius to understand she wasn’t guilty of committing espionage. And that was the basis of the investigation. It was always flimsy.
She did not commit espionage but she did violate the Espionage Act which has provisions in it that criminalize certain acts that facilitate or could facilitate espionage- ie. removing government records from their normal case of safekeeping in a grossly negligent manner.
Comey even wrote several versions of his summary of findings and conclusions where he referred to her acts as "gross negligence." Those words were of course changed by people who were working on an insurance policy.
Of course, Comey was running a highly "efficient and streamlined" investigation. He concluded that she did nothing illegal before even interviewing her or the witnesses.
Also they conveniently did not look at any the pay to play/Clinton foundation allegations. You think if Mueller were investigating Trump and had those types of allegations that he would not have gone there? He would have an indictment on Chelsea and go from there. FBI= FIX IS IN when it came to Hillary.