Hillary Clinton checked every box required for a felony violation of Section 793(f) of the federal penal code (Title 18): With lawful access to highly classified information she acted with gross negligence in removing and causing it to be removed it from its proper place of custody, and she transmitted it and caused it to be transmitted to others not authorized to have it, in patent violation of her trust.
In essence, in order to give Mrs. Clinton a pass, the FBI rewrote the statute, inserting an intent element that Congress did not require. The added intent element, moreover, makes no sense: The point of having a statute that criminalizes gross negligence is to underscore that government officials have a special obligation to safeguard national defense secrets; when they fail to carry out that obligation due to gross negligence, they are guilty of serious wrongdoing. The lack of intent to harm our country is irrelevant. People never intend the bad things that happen due to gross negligence.