When Fox News anchor Bret Baier asked about the origin of the infamous Trump dossier, James Comey brushed off most of the questions. The former Federal Bureau of Investigations director said someone on his “senior staff”—he couldn’t remember who—had “briefed” him on the dossier “sometime in the fall” of 2016. Mr. Comey had been told it came “from a reliable source.” He insisted he “never knew exactly which Democrats had funded” it. He then continued on about his book, which meditated on the importance of “truth.”
That interview,...