In April this year, Robert F Kennedy Jr, nephew of former President Kennedy, announced his own bid for the presidency running as a Democrat. Recently, supporters of Joe Biden couldn’t ignore RFK Jr’s headline-grabbing appearances on two controversial podcasts - and the news that among Democrats he has an approval rating of 20%. This week, Jonathan Freedland speaks with author and presenter Mehdi Hasan about RFK Jr’s popularity among Republicans and whether Joe Biden should engage with his main rival in the presidential race.