The world holds its breath as American voters hit the ballot box today for the 2016 US presidential election. Not only could the international community be dealing with a populist President in the shape of Donald Trump - his victory will heighten wariness of populism stirring elsewhere in the world.
So, how should we understand the movement that propelled Mr. Trump? Is it something to welcome or to fear? Jan-Werner Muller is Professor of Politics at Princeton University and author of 'What is Populism?', a book that attempts to extract the core of the populist ideology.
Share Radio's Alex Clark spoke to Professor Muller. 'What is Populism?' is published by Penn Press and retails for £13.00.