Donald Trump's speech to the Boy Scouts Jamboree: why he says the same things to very different audiences

Donald Trump's speech to the Boy Scout jamboree has been criticised as wildly inappropriate. But to a populist, there might only be one audience - and it might not be the physical people right in front of you. Ben Margulies looks at how the logic of populism may explain Donald Trump's tendency to return to the same themes in very different settings.