Mueller doesn't have any authority. He's about to get his bye Felicia moment. Hopefully Rosensteint gets his as well.
You have no idea how much I hope this will be true. I have my doubt though. I think Mueller will release a scathing report and Dems will try Impeachment but will fail in 2019 due to not having enough Senators willing to Impeach. The House will pass it in 2019 if the House goes Democrat which in all indications it seems to be heading that way.