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| January 6 |
It is a question that has dogged Donald Trump - fairly or otherwise - since he was elected president: is he mentally fit for office?
The question has been raised again by the release of a new book by New York journalist Michael Wolff, which chronicles the first year of the Trump White House.
The book - the accuracy of which has been disputed by the White House and queried by others - paints the president as impatient and unable to focus, prone to rambling and repeating himself.
Mr Trump has hit back against Mr Wolff's account, claiming on Twitter to be a "very stable genius" whose "two greatest assets have been mental stability and being, like, really smart".
But the president's manner and speaking style have led to armchair diagnoses of a host of ailments, from Alzheimer's to narcissistic personality disorder - a controversial practice that has divided the medical profession.
