Has there ever been a POTUS about whom people questioned his mental state? What would happen if a POTUS exhibited signs of dementia/Alzheimer's/senility?

by zjh1990

erichiro

Did Reagan have alzheimers during his presidency?

huskersax

As a follow-up: What credence is there to the myth that Edith Wilson ran the presidency after Woodrow's 1919 stroke?