Hillary Clinton's early exit from 9/11 ceremony down to pneumonia, says doctor

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A video has surfaced of Hillary Clinton looking unwell as she left a ceremony at the National September 11 Memorial today, appearing almost to collapse as she entered her car.

Her doctor has now said Clinton's condition is down to pneumonia. Dr Lisa Bardack said she had put the Presidential candidate on antibiotics and advised her to rest and modify her campaign schedule after diagnosing her on Friday.

Clinton leaves the 9/11 memorial ceremony
Clinton left the service in a hurry (Andrew Harnik/AP)

Bardack said Clinton had become overheated and dehydrated at the 9/11 event, causing her frail appearance.

Clinton is "recovering nicely" since she left the memorial ceremony in New York added the doctor.