McCain was last reelected in 2014, he would be due for reelection in 2020. So if he dies this year or next it is possible that his Cindy McCain would be appointed to fill his seat for the rest of his term, provided she would want it.
That is however just speculation.
42 posted on 05/13/2018 6:24:03 AM PDT by Kaslin
(Politicians are not born; they are excreted -Civilibus nati sunt; sunt excernitur. (Cicero))