These things always turn into fishing expeditions, and no one ever acts to stop it from happening. Have we finally reached the moment when that changes?
Manafort sues Mueller, says he exceeded his special counsel authority by indicting him
I don't know if Paul Manafort can win this suit, but the very fact that he's filing it means we've reached a point where someone has decided to stand up to one of these special counsels - an investigator no one can limit or fire, because politics decided that making the man "independent" was more important than safeguaring the rights of people who might become his targets.
Robert Mueller is out of control. But every independent counsel ends up that way. They're given carte blance to investigate a given matter, but they're also told that if they uncover any evidence along the way of unrelated crimes, that's fair game too. In other words, the scope of their assignment is really limited only by the bounds of their imaginations. No one has demonstrated there is any evidence the Trump campaign colluded with Russia, and none of the charges brought to date are even tangentially related to such a scenario.