Rory Stewart, the former international development secretary and Conservative leadership candidate, speaks to Rachel Cunliffe about the lessons he learned from running for leader in 2019. They talk about whether this year’s candidates show growing diversity in the party, why our political culture has got so bad at argument and debate, and what he got wrong when he was in government.Stewart’snew series,The Long History of Argument, starts on BBC Radio 4 on 19 July at 9am.Podcast listeners can subscribe to theNew Statesmanfor just £1 a week for 12 weeks using our special offer. Just visitnewstatesman.com/podcastoffer. See acast.com/privacy for privacy and opt-out information.