Errol Morris has interviewed many controversial figures from Donald Rumsfeld to Steve Bannon, but when he sat down with author and former spy David Cornwell - aka John le Carr\xe9 - he finally met his match in terms of intelligence and preparation. Morris joined us to discuss the interview with Cornwell that resulted in \u201cThe Pigeon Tunnel,\u201d one of the director\u2019s most compelling and entertaining films to date.\nLearn more about your ad choices. Visit megaphone.fm/adchoices