Brian Downing, political-military analyst and author of "The Military Revolution and Political Change" and "The Paths of Glory: Social Change in America from the Great War to Vietnam," joins us to discuss factors complicating the Afghan peace process. "Diplomats had told Reuters that the talks got off to a difficult start, with disagreements over how the Hanafi Islamic code could be used to guide negotiations and on whether the deal signed between the United States and the Taliban in February should be the basis for the talks, as demanded by the Taliban," Reuters reported Tuesday. "A ceasefire is a top priority for the Afghan officials and the western diplomats who are facilitating these talks."