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FILE – In this Aug. 28, 2017, file photo, Illinois Speaker of the House Michael Madigan, D-Chicago, looks out over the floor the Illinois House at the Illinois State Capitol in Springfield, Ill. (Justin L. Fowler/The State Journal-Register via AP, File)

CHICAGO (AP) — The Illinois House has formed a special panel to investigate Speaker Michael Madigan, who has been implicated in a federal bribery probe.

Republicans petitioned to form the committee earlier this week, saying Wednesday that the House must “do its job and conduct a thorough investigation.” Republicans and some Democrats have called on Madigan to step down after federal prosecutors named him by title in a criminal investigation in which ComEd acknowledges engaging in bribery in the Capitol.

Madigan hasn’t been charged and repeated Wednesday that he hasn’t engaged in wrongdoing.