Donald Trump has disowned his long-time butler who called for President Barack Obama to be killed and for a US city that had been the site of protests to be "carpet bombed".

Anthony Senecal was Mr Trump's personal butler for nearly two decades, and says he is still employed at the property mogul's Mar a Lago resort in Florida as the property's unofficial historian.

On Wednesday he took to Facebook to support Mr Trump, and denounce the billionaire's political opponents.

In the rambling post first reported by Mother Jones, the news magazine, Mr Senecal suggested that Hillary Clinton was a murderer and that Mr Obama should be assassinated.