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But opinion polls over decades have indicated that most Americans don't believe Oswald was the sole assassin.

And, when that power comes on and pulls Scotland this way and that, enter the French assassins behind the scrum - all clever angles and deception, outrageous vision and ruthless execution.

But it took an interviewer calling her a "man-eating, confident assassin" to realise "if that's what people think of me then I need to be more open and let people in".

Part of Trump's confidence stems from having outmanoeuvred his political foes, evaded any punitive measures in his myriad legal battles and even escaping an assassin's bullet, Mr Brinkley said.

The assassin walks quickly back to his motorbike, appearing to throw something away as he does, and drives off.