UPDATE 5/31/13 @ 3:48 p.m.
FRANKFORT, Ky. (AP) -- A Kentucky man has admitted to secretly recording a private campaign meeting between Senate Republican Leader Mitch McConnell and his aides earlier this year.
Curtis Morrison of Louisville made the admission Friday in a first-person account posted on Salon.com, where he also said an assistant U.S. attorney has notified his attorney that a grand jury will consider bringing charges next Friday.
A spokeswoman said the U.S. attorney's office in Louisville would not comment. It was unclear who was representing Morrison. Morrison's phone had been disconnected, and he did not immediately respond to an email Friday.
Morrison, a former volunteer for the political group Progress Kentucky, also acknowledged in the story that he provided the recording to Mother Jones magazine.
On the recording, McConnell and his aides talked about opposition research into potential Democratic challengers.
The spot titled "How Dirty?" claims McConnell is President Barack Obama's "number one target" and that "liberals will do anything to beat McConnell."
The ad cites the secret recording, which sparked an FBI investigation last week and is tied to the fringe group Progress Kentucky. It also cites Progress Kentucky's tweet in February that referenced the Asian heritage of McConnell's wife, for which the group later apologized.
McConnell's spot points to another ad, made by the liberal group Americans United for Change, which claims McConnell is aligned with al-Qaeda because he opposes background checks for gun buyers.
McConnell campaign manager Jesse Benton said Tuesday his staff is working with the FBI because of what he called "Watergate-style tactics" to bug the office.
Mother Jones magazine published the recording of the February meeting in which McConnell aides were discussing research into potential Democratic challengers, including actress Ashley Judd, who later decided not to run. Aides talked on the recording about Judd's political positions, religious beliefs and mental health.
Benton said a recording device had been placed in McConnell's office without consent.
The FBI confirmed that it was contacted by McConnell's office and was looking into the matter. The magazine's Washington bureau chief, David Corn, said in a statement that the magazine wasn't involved in making the tape but understood it wasn't the result of any bugging operation.