Are airstrikes against the Islamic State working? The U.S. military has acknowledged that it launched an airstrike against ISIS in Mosul. Locals say more than 100 civilians were killed. President Trump says defeating ISIS is his top foreign priority, and gains have been made. But at what cost? 1A guest host Indira Lakshmanan discusses the latest in the fight against ISIS with Tom Bowman, Pentagon correspondent for NPR, Jessica Stern, professor at Boston University and coauthor of "ISIS: The State of Terror", Ret. Lt. General James Dubik, senior fellow at the Institute for the Study of War and Ambassador Lukman Faily, former Iraqi Ambassador to the United States.