Added a source close to the campaign: “We’re going on the assumption that a crime has been committed. No one at the meeting leaked this.”

The McConnell campaign has not offered any direct evidence the recording was the result of an illegal bug.

The FBI office in Louisville, Ky. confirmed McConnell’s office had contacted them and that the bureau was looking into the matter.

On Tuesday morning, Mother Jones, a liberal magazine, published an audio recording of McConnell staffers discussing opposition research they could use against actress Ashley Judd, who was considering running against veteran senator in the 2014 Senate race. Judd announced last week that she would not make the race.

The magazine reported that in the Feb. 2 recording, McConnell and his aides were heard considering attacking Judd for “past struggles with depression and for her religious views.”

Someone on the tape is heard saying:

“She’s clearly, this sounds extreme, but she is emotionally unbalanced. I mean it’s been documented. Jesse can go in chapter and verse from her autobiography about, you know, she’s suffered some suicidal tendencies. She was hospitalized for 42 days when she had a mental breakdown in the ’90s.”