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 of the U.S. ambassador to Libya and three others. But in doing so, the lawmakers reminded us why “congressional intelligence” is an oxymoron.

Through their outbursts, cryptic language and boneheaded questioning of State Department officials, committee members left little doubt that one of the two compounds at which the Americans were killed, described by the administration as a “consulate” and a nearby “annex,” was a CIA base. They did this, helpfully, in a televised public hearing.

“Point of order! Point of order!” Rep. Jason Chaffetz, R-Utah, called out as a State Department official, seated in front of an aerial photo of the U.S. facilities in Benghazi, described the chaotic night of the attack. “We’re getting into classified issues that deal with sources and methods that would be totally inappropriate in an open forum such as this.”

A State Department official assured him the material was “entirely unclassified” and the photo was from a commercial satellite. “I totally object to the use of that photo,” Chaffetz continued. “I was told specifically while I was in Libya I could not and should not ever talk about what you’re showing here today.”