U.S. Defense Secretary James Mattis , right, consoles outgoing Afghanistan Defense Minister Abdullah Habibi (back to camera), who resigned his post earlier in the day in the wake of a deadly attack on an Afghan base, at the start of a meeting at Resolute Support headquarters in Kabul, Afghanistan, Monday, April 24, 2017. Mattis arrived unannounced in Afghanistan to assess America's longest war as the Trump administration weighs sending more U.S. troops. (Jonathan Ernst/Pool Photo via AP)