... the grand jury can investigate merely on suspicion that the law is being violated...
NOBODY has declared which law(s) Trump, or his election team, has violated
Yes, and that is well-called out in Judge Janine’s link above. View it.
Unlike Mueller’s fishing expedition, there is solid evidence of crimes by Clinton, Lynch, Comey, and many others. Yet, Sessions is doing nothing and will do nothing. Forget the FBI as long as McCabe is acting director.
So one recourse is a “Scalia Grand Jury” after US v. Williams. It’s an option and it should be used to force Mueller to back down and dissolve his witch hunt.