When House Republicans called a hearing in the middle of their long recess, you knew it would be something big, and indeed it was: They accidentally blew the CIA’s cover.

The purpose of Wednesday’s hearing of the Oversight and Government Reform Committee was to examine security lapses that led to the killing in Benghazi last month of the U.S. ambassador to Libya and three others. But in doing so, the lawmakers reminded us why “congressional intelligence” is an oxymoron.