John Harris, the chief of staff for embattled Illinois Gov. Rod Blagojevich, has resigned, Crain’s ChicagoBusiness Journal reported on its Web site Friday, citing people close to the matter. Harris’ resignation comes after earlier media reports that Illinois Attorney General Lisa Madigan was going to appeal to the state’s Supreme Court to force Blagojevich out of office.

Harris was the only party other than Governor Blagojevich specifically identified in the federal affidavit released Tuesday. Rumors are also circulating that Blago himself might soon step down.

Update: The Chicago Tribune confirms that Harris has resigned:

John Harris resigned this morning as Gov. Rod Blagojevich’s chief of staff, his lawyer said. Harris dropped off his letter of resignation today in person and will not be going back to the office, according to his lawyer, Terry Ekl.

Harris and Blagojevich were arrested at their homes Tuesday morning on federal corruption charges. Each was released on a personal recognizance bond after a court hearing.