President Trump has pardoned I. Lewis “Scooter” Libby, convicted in 2007 of perjury and obstruction of justice. The president was right to do so. Mr. Libby’s conviction was a travesty.

Mr. Libby, who served as Vice President Dick Cheney’s chief of staff, got caught up in a special counsel’s investigation about the disclosure to the press of a CIA agent’s identity. It appears Mr. Cheney was the investigation’s real target. Mr. Libby’s lawyers have said prosecutors offered to drop the charges against Mr. Libby if he would incriminate...