‘I think what Trumpism is about, is an understanding that the system in America is not working for working-class people,” says Bernie Sanders, sitting in the Guardian’s offices in London. “In a phoney, hypocritical way, Trump has tapped into that. His quote-unquote ‘solutions’ will only make a bad situation worse.”

In person, Sanders’ 83 years read differently than in photograph, perhaps because of how conversational he is. His voice is magnetic – a Brooklyn accent that feels both warm and tough. “But what I have been aware of, and I’ve talked about it for years, is that in America, the very richest people are doing phenomenally well, while 60% of our people live paycheck to paycheck.”

Later, he will say the same thing to an audience in London – only with more emphasis and passion. “Sixty per cent. Six-zero. Do you know what paycheck to paycheck means?” It’s exhilarating to hear Sanders speak to a crowd: his zeal is reflected back in their faces, his moral clarity is such a relief, set against the cynicism and resignation of most of the Democratic party’s opposition to Trump and his administration. Class war is as old as time, but it’s a peculiarity of this age that you rarely hear a politician name it. “I do,” he tells me. “There is a class war going on. The people on top are waging that war.”