I'm sorry he's dying, but he's voting and recommending by his anger at Trump. He campaigned on repealing Obamacare in 2016, yet he cast the vote that prevented it from happening.
He advises against voting for Haspel because she refused to say waterboarding was immoral, yet voted for Brennan who was actually in a position of authority in the CIA during that period.
He personally hand delivered the Dossier to the FBI, knowing full well that the DNC paid for it, but it would look more damaging if a Republican gave it to the FBI.
Finally, instead of relinquishing his seat knowing he can't carry out the task he was elected for due to illness, he's holding out long enough to prevent a special election, in order for him to name his replacement, his wife or a "McCain person" as if the Seat is his personal posession. He is the problem with Washington