Chicago Ald. Patrick Daley Thompson was implicated in the plea agreement of a former bank employee who federal prosecutors said played a critical role in the embezzlement scheme. She said millions in theft was covered up before the bank failed.

Chicago Ald. Patrick Daley Thompson, related to both Mayor Daleys, faces federal charges stating he filed false tax returns and lied about $219,000 in payments from a neighborhood bank. Over 30 Chicago aldermen have been convicted or charged with corruption.

The Democratic nominee in the Cook County assessor’s race is voicing support for a ban on city aldermen doubling as property tax appeals attorneys, an arrangement that encourages conflicts of interest.