The Wall Street Journal continues to counter the liberal mainstream media's anti-Trump-ness with today's op-ed from Steven Calabresi, who served as a special assistant to Attorney General Edwin Meese (1985-87) and a law clerk to Justice Antonin Scalia (1987-88). Calabresi proclaims that Mueller's investigation has crossed the legal line, explaining that it's unconstitutional under 'Morrison vs Olson' - the decision, not the dissent...

Judge T.S. Ellis has expressed skepticism about the scope of special counsel Robert Mueller's investigation. "What we don't want in this country is... anyone with unfettered power," Judge Ellis, who is to preside over the trial of former Trump campaign manager Paul Manafort, told prosecutor Deputy Solicitor General Michael Dreeben May 4. "So it's unlikely you're going to persuade me that the special prosecutor has unlimited powers."

Judge Ellis is right to be skeptical. Mr. Mueller's investigation has crossed a constitutional line, for reasons the U.S. Supreme Court made clear in the 1988 case Morrison v. Olson. That case is best known for Justice Antonin Scalia's powerful lone dissent arguing that the post-Watergate independent counsel statute was unconstitutional. But Chief Justice William Rehnquist's opinion for the court, while upholding the statute, set forth limits that the Mueller investigation has exceeded.