The effort to sink Justice Brett Kavanaugh’s confirmation cries out for investigation. The Senate Judiciary Committee has already made a criminal referral to the Justice Department regarding alleged material misstatements by lawyer Michael Avenatti and his client Julie Swetnick. And a new book by two New York Times reporters contains a potentially explosive revelation.

In “The Education of Brett Kavanaugh,” Robin Pogrebin and Kate Kelly report that Leland Keyser—who was unable to corroborate high-school friend Christine Blasey...