In essence, Mr. Mueller is saying that if he could have exonerated the president here, he would have, says Ken Hughes, a research specialist and expert on presidential abuse of power at the University of Virginia’s Miller Center who has spent two decades mining President Richard Nixon’s tapes. But Mr. Mueller was unable to reach that judgment. “Really, the special counsel’s office is saying, they couldn’t charge him because he’s president. That’s the overarching theme,” says Mr. Hughes.
Ken Hughes