Donald Trump's detractors have called him a sociopath, psychopath, and narcissist, or as having an anti‐social personality disorder. To his supporters he is a charismatic representative of the people. This article looks at the precise definitions of some of these terms and makes use of the available collateral information to make a tentative diagnosis of Donald Trump. It then considers the extent to which Donald Trump's personality traits may be an issue should he become president. Although concluding Mr Trump's behaviour could be detrimental not just to the United States, but also to world stability, this article moves on to consider whether he is the main problem, or merely symptomatic of a much bigger, global shift towards more extreme politics that is actively seeking destabilisation of the current political and economic elite. Copyright © 2016 John Wiley & Sons, Ltd.