Gamechanger. Joined from the white house by nbcs hans nichols and justice correspondent Pete Williams with me from washington. We know now this federal judge has ruled a former White House Counsel Don Mcgahn will have to follow the subpoena from white House Democrats. We know it stems from the mueller investigation. Take us how this could potentially impact the impeachment investigation. Thats a political question. Im not sure the answer to that. Theres a couple of variables here. Number one, yes, the governor has filed a notice of appeal of the judges ruling. I assume at some point theyll ask for a stay to temporarily stop the effectiveness ruling while they pursue their appeal in the d. C. Court of appeals. Whoever loses there im sure will go to the supreme court. Remember how this got started. This was the House Judiciary Committee asking for don mcgahns testimony about things that were raised in the mueller report. Now obviously the impeachment inquiry has turned in a totally diffe