Actually the DOJ guideline doesn't allow an indictment of a president from the DOJ. From an impeachment hearing? Yep.
Mueller did NOT exonerate Trump of obstruction of justice.
Trump's presidency is the biggest hoax in American political history.
As for 2020? PLENTY of time for Trump to commit new horrors, and for those 12 criminal referrals to bite him in his ever fatter ass. Odds are very good that more plea deals will provide more evidence against Trump