I think Flake has probably got to go in the primary. He has no chance of re-election in the general with a sub 20% approval rating. If the rest vote for tax reform, a border wall, immigration reform, and stop stalling on Trump’s nominees, I’m fine leaving the rest alone.
So long as they play nice. Then you send them down a gently sloping incline towards their ultimate oblivion. That’s how you drain the swamp. Alter the surface grade.