Embedded Player Preparations are under way at Guantanamo Bay, Cuba, for the first military tribunal under the Obama administration. The trial of Omar Khadr is expected to start Tuesday. He was captured in Afghanistan and brought to Guantanamo eight years ago when he was just 15. Karen Greenberg, author of The Least Worst Place: Guantanamo's First 100 Days, talks to Renee Montagne about Khadr.