the idea behind the attorney general appointing a Parliamentary house speaker is the DOJ stand as witness and the venue should bring a lot of reality to light, hence what is said therein may be used to improve policing methods or community trust programs; furthermore hence the reason the secretary of state presides sort of the way vice sits over congress thus when outside influences do become a factor then the state department become aware of it and can inform the president then in turn perhaps the information gets passed onto DHS along with an executive order... and so on