Well? Does the bishop have them? If so, he needs to use them.
Bishops have to follow canon law like anyone else.
You cannot canonically remove someone from his ministry just because he is a loudmouth jerk.
You have to be able to prove in court that he is an egregious lawbreaker. There is a process, and Pfleger knows the process as well as anyone, and he knows how to bend canonical limits without breaking them too often.
Fr. Pfleger on "snuffing" pro-gun legislators and gun shop owners