Illinois House Speaker Michael Madigan has asked for an outside review of whether he or his staff retaliated against a lawmaker for speaking out on sexual harassment.

Madigan released an open letter yesterday to Legislative Inspector General Julie Porter. It asks for a probe into claims by Rep. Kelly Cassidy that the interference of Madigan allies forced her resignation from a part-time job with the Cook County Sheriff’s Department.

Cassidy says she’s a target because she called for an independent investigation in February of allegations that staff members in Madigan’s political operation had not been properly disciplined for sexual harassment.