Update: Hillary Clinton diagnosed with pneumonia

Update 11.13pm: Hillary Clinton was diagnosed with pneumonia on Friday, her doctor has revealed, after the Democratic presidential nominee abruptly left a September 11 anniversary ceremony feeling "overheated".

A video showed Ms Clinton slumping and being held up by three people as she was helped into a van after the event, and her doctor said in a statement that she had become overheated and dehydrated.