You can’t pardon a person that has not been convicted.
It would be useless to put Obama on trial. The judge would be someone he or Biden appointed and all of the jurors would be Democrats who hate Trump. So few people in DC voted for Trump that it would be easy for the defense attorneys to keep anyone like that off the jury.
Really? Might wanna keep up with the current news.
Presidential Pardon from POTUS-
Joey Shiiites his Pants did it for many.