Looking at Donald Trump's recent public appearances, and seeing the reports on his behavior in more private settings, it's striking how closely his symptoms match those of a person suffering from dementia and approaching stage 5 of 7, the "middle stage" where the patient suffers from a more severe loss of cognitive functions and exhibits disorientation, delusions and denial.
Leaving the US in the hands of an invalid doesn't exactly strike me as a wise choice. Donald Trump needs to be examined for dementia right away.