Good luck doing anything about it if he does have dementia. I couldn't even get the DMV to take away a parent's license, despite specific examples of what they had done on the road. Ultimately, a non-fatal car accident took care of the problem...but it's really an impossible condition to get anyone to take action on a small everyday level. As president, they would be untouchable. I don't think he has that, but I won't rule it out as a coming attraction in this national s**t show.