I realize that since Senator McCain did not graduate anywhere close to the top of his class at Annapolis (he finished closer to the bottom) and the fact he has brain cancer might limit his ability to make intelligent informed decisions.
Since he cannot make decisions for himself his family needs to step in and encourage him to resign from the Senate so the governor of Arizona can name a replacement (hopefully not another McCain).
It has been pointed out numerous times with McCain no longer casting votes in the Senate the Republicans only have a one vote advantage (50 to 49) which means that it would only take one RINO (Susan Collins comes to mind) to sink President Trump's Supreme Court pick.
I have not recently perused the U.S. Constitution but I believe there are options available to the Senate to remove one of their members when they cease to be competent enough to perform the job. I assume the Senate is unwilling to forcibly remove McCain because they fear that would leave a "black mark" on his record. Apparently they have not realized that most of his career in the Senate left a black mark on his record.
There is not much I am inclined to thank the Obama voters for, but they did save the nation from John Boy McCain.