Unless there is punitive action against McCain, and against bureaucrats, Trump’s plans will grind to a halt. The stakes are higher than most recognize.
A US Senator can’t be recalled or impeached. The Senate GOP caucus could strip him of committee assignments or seniority, or even expel him from the caucus. President Trump can negotiate with McConnell and other Senate leaders to force McCain’s humiliation.
A senator can be expelled from the Senate, but the two-thirds vote required isn’t realistic.
He certainly should be stripped of committee assignments.