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A new study of psychopathic traits by Oxford University psychologist discovers that Donald Trump ranks above Adolf Hitler and only just below Idi Amin, Saddam Hussein and Henry VIII. Hillary Clinton ranks between Napoleon and Nero.

The current race to the White House has not been short of people questioning the candidates' states of mind. But what happens if you take a more scientific approach?

Oxford University's Dr Kevin Dutton has been exploring the psychopathic traits of the US presidential hopefuls and historical figures using a standard psychometric tool – the Psychopathic Personality Inventory – Revised (PPI-R).

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