After diagnosis of glioblastoma, average remaining lifespan is 14.5 months, though some few hang on for as much as five years. That's what did in the former Lyin' of the Senate, "Swimmer" Ted Kennedy. McCain should have retired years ago, but it looks as though this will be another forced removal from orifice.
Nature doesn't need Trump to find ways to drain the swamp.
I don't dislike McCain, unlike my view of Swimmer, but I've never seen him as part of the solution in D.C. - more like part of the problem.