Can they? Probably. Will they?? Different question and the answer is probably not. They have bowed to Obama over and over again and they don’t fear the rank and file GOP - they are like an abusive husband telling us we have nowhere to go and unless the rank and file get on board with forming a third party (like the GOP was to the Whigs) the status quo will remain.
Mc Connell and Grassley already and they are the leaders not Cruz of the Senate and Judiciary Committee no hearings for an Obama Supreme Court Nominee