NATO leaders are gathered in Turkey for a summit that will test whether unity can hold, after a year of deepening tensions between the US and its allies. Joining the show to discuss are New York Times National Security Correspondent David Sanger and former US Ambassador to Turkey and Iraq James Jeffrey. Also on the show: Kholood Khair, Sudanese Political Analyst & Nathaniel Raymond, Executive Director, Humanitarian Research Lab, Yale; CNN Senior International Correspondent Melissa Bell; David Wallace-Wells, author, "The Uninhabitable Earth"  Learn more about your ad choices. Visit podcastchoices.com/adchoices