Lawyers on Tuesday hammered out a few last-minute issues involving evidence and jury instructions before testimony begins.
But, the majority of their time was spent discussing a prosecution witness who filed a sexual harassment complaint in 2017 against a political operative in Madigan's organization, Kevin Quinn.
Quinn was eventually fired.
Prosecutors want to call Alaina Hampton to show a pattern of behavior.
Defense attorneys want limits on Hampton's testimony, saying it would be highly prejudicial and irrelevant to bring in sexual harassment claims.
Charged along with Madigan is former ComEd lobbyist Michael McClain.
A federal grand jury handed down a superseding indictment in October 2022, adding a new charge of conspiracy.
According to the indictment, his job was to conceal and hide the illegal operation of the enterprise shielding Madigan from the criminal activity.
Prosecutors say because Madigan's co-defendant McClain worked to funnel secret payments to help Quinn, it will help establish a pattern of concealed payments, which are part of the conspiracy alleged against Madigan.