Below is a montage of various political figures shown wearing their boots. Not too long before McCain "expired," he was  also shown wearing a boot.

I would normally say that this is a huge stretch ...
...
except
...

for the fact that  John McCain was actually caught wearing the boot on the OPPOSITE foot/leg that he had it on earlier.

https://thehill.com/blogs/blog-briefing-room/361682-mccain-explains-why-his-boot-was-on-a-different-foot

Sen. John McCain (R-Ariz.) on Thursday clarified that his walking boot is on his right foot, adding that he switched it to his left to “give it a break.”

McCain caused confusion when he posted a photo from his daughter Meghan’s wedding in which his walking boot was on his left foot. He had previously been seen wearing it on his right foot after he suffered a minor tear in his right Achilles tendon. 

His "explanation", if this was in fact an Achilles tear, is preposterous.  If you wanted to give your foot a break, you would simply remove the boot.  What is the point of putting it on the GOOD foot?  That's just stupid.

Maybe the ankle bracelet was allowed to be moved to the other foot because it was causing some chaffing or some other issue.

Here's McCain:

Thank you. This is an interesting find.

Can someone please explain what is an ankle bracelet for?

An ankle bracelet is a monitoring tool that is placed on those accused or convicted of crimes to track their movements and to prevent their escape.

Dec 17, 2018

Criminal offenders wear ankle bracelets while sentenced to house arrest, parole or probation. They may be worn before or after a person goes to trial on criminal charges. The bracelets can monitor alcohol consumption and the location of undocuмented immigrants facing removal from the United States.

https://legalbeagle.com/8300133-reasons-ankle-police-bracelet.html