They said there was "no purely military solution for Iraq" and "without major progress on the political and economic fronts, the U.S. intervention is simply buying time." They also urged "that any new strategy be sensitive to regional context, particularly the impact of political or military decisions." They fear that throwing too much support to the Shiite majority may lead Sunni nations in the region to step up support of Sunni insurgents, and that a crackdown on Iraq's largest Shiite militia, the Mahdi army, may instigate more interference by Iran.[26]