- Fight vs. ISIS has brought Iraq's ethnic and sectarian groups together for the moment, Peter Bergen writes
- But he says, rivalries could resurface with a vengeance
Peter Bergen is CNN's national security analyst, a vice president at New America and a professor of practice at Arizona State University. He is the author of "United States of Jihad: Investigating America's Homegrown Terrorists."
Sulaimani, Iraq (CNN)In a tea room in Sulaimani's old bazaar that's dense with the smoke of scores of cigarettes, bunches of grizzled, middle-aged men -- some wearing traditional Kurdish baggy trousers, other wearing suits without ties -- are arguing furiously about the great question of the day: