By long-standing tradition, some topics for the President are off limits in press conferences and interviews. Obviously, some aspects of national security fall into this category. But last night President Obama strayed into territory few thought he'd risk talking about in public, the use of unmanned drones. The President was taking part in a an hour-long video "hangout" on Google's social network when he starting laying out a detailed defense of America's drone policy. Ilyias Khan, Islamabad reporter for our partner the BBC, joins the program.