After the attempted assassination of Donald Trump over the weekend, the Republican national convention gathered in Milwaukee this week to welcome him as the party’s presidential nominee. But not all eyes were on the former president. Standing next to him, above the chanting crowd, was his newly appointed candidate for vice-president, JD Vance. It was a surprising move for the Ohio senator and author of Hillbilly Elegy, who once described himself as a ‘never Trumper’ and his new boss as ‘America’s Hitler’. So what’s behind this transformation, and what’s in it for Trump? To find out, Jonathan Freedland is joined this week by Tara Setmayer, a former Republican congressional communications director