It's just straight clinical psychology "If a patient presented to me with the verbal incoherence, tangential thinking, and repetitive speech that Trump now regularly demonstrates, I would almost certainly refer them for a rigorous neuropsychiatric evaluation to rule out a cognitive illness," he wrote.
"A condition such as vascular dementia or Alzheimer’s disease would not be out of the ordinary for a 78-year-old.... For those who do have such diseases or conditions, several treatments and services exist to help them and their loved ones cope with their decline. But that does not mean any of them would be qualified to serve as commander in chief."