People... Even rich wealthy people who happen to be President of United States are innocent until proven guilty... So Mueller had no business exonerating or not exonerating the president... If there are no crimes, no criminal referral and no evidence of wrong doing. There is no exoneration needed.
Ask any Democrat: “Is anyone above the law, even the President of the United States?”
Of course Democrats will wildly respond that no one is above the law!
Next question: “Are people who are in this country illegally above the law?”
Silence.