The U.S. Attorney's office is expected to release audio and transcript of the conversation today.
The recorded call between Roland Burris and Robert Blagojevich took place Nov. 13 on the Friends of Blagojevich land line, which was tapped by the FBI.
The Senate ethics panel asked the U.S. Attorney's office for the tapes in March, according to an opinion released today by Judge James Holderman.
The panel launched a preliminary inquiry into the "circumstances surrounding the appointment and seating of Senator Roland Burris," according to Holderman's opinion.