The man who calls himself the 'mastermind' of the 9/11 terror attacks is heading to trial in U.S. federal court. Khalid Sheikh Mohammed and four of his alleged co-conspirators will be moved from Guantánamo Bay to face trial in lower Manhattan – just blocks away from the World Trade Center site. We speak to Slate senior editor Dahlia Lithwick about some of the challenges involved in such a trial. We also hear from attorney Jonathan Hafetz, co-editor of "The Guantanamo Lawyers: Inside a Prison Outside the Law." Hafetz represents Mohamedou Slahi, a Guantánamo detainee who may also be headed to the same civilan court.