It has occurred to many Republicans that this may be what is happening. If some POTUS was pretending to be a Republican but his real intention was the destruction of the party he wouldn't need to do anything much different than what tRump has done. I have seen numerous life long Republicans say that they are going to vote for the Democrats and the reason that gave was that they have never seen such corruption and treason in a POTUS before. That is being reflected in the recent polls.