Can the Islamic State and al Qaeda Find Common Ground?

Three years after the Islamic State defected from al Qaeda in an acrimonious and highly public split, many are still concerned that the two could someday reunite. The warnings of figures like Georgetown University's Bruce Hoffman have been given new life over the past few months as the Islamic State continues to take heavy losses on the battlefields in Iraq and Syria. The idea of the global jihadist movement's two major poles joining forces is certainly a troubling one. The combined capabilities of the Islamic State and al Qaeda could pose a significant threat to the rest of the world, making them a much more dangerous enemy together than divided. But even with the Islamic State's recent setbacks, an alliance between it and al Qaeda would be far more difficult to accomplish than you might expect....