"White House Counsel Don McGahn will be leaving his position in the fall, shortly after the confirmation (hopefully) of Judge Brett Kavanaugh to the United States Supreme Court. I have worked with Don for a long time and truly appreciate his service!" Trump said in a Twitter message.
In addition, Axios reported that McGahn hadn't officially named his successor but wanted to be replaced by Emmet Flood, who is currently heading the Trump administration’s legal team for Special Counsel Robert Mueller’s Russia probe.
McGahn served as general counsel for Trump's campaign and transition team.