On Saturday night in London, word came through that Donald Trump had been injured during one of his rallies in Pennsylvania. A shooter, who killed another person and seriously injured others, was killed by Secret Service agents. As the US comes to grips with what just happened, Jonathan Freedland presents as special edition of Politics Weekly America. He hears from former Bill Clinton advisor, Sidney Blumenthal on what this tragedy means for Donald Trump with less than five months until the election. Help support our independent journalism at theguardian.com/infocus