Republican Sens. John McCain of Arizona and Lindsey Graham of South Carolina believe airstrikes aren't enough. "The president needs to devise a comprehensive strategy to degrade ISIS," they wrote in a joint statement. "This should include the provision of military and other assistance to our Kurdish, Iraqi, and Syrian partners who are fighting ISIS. It should include U.S. airstrikes against ISIS leaders, forces, and positions both in Iraq and Syria. It should include support to Sunni Iraqis who seek to resist ISIS. And none of this should be contingent on the formation of a new government in Baghdad."