What can the U.S. do to stop the Islamic State?

Aired: 5/21/2015 | 0:07:33 | Clip
New victories by the Islamic State in Syria, Iraq and Libya are fueling debate and criticism in Washington over the U.S. strategy and reliance on airstrikes against the militant group. Gwen Ifill talks to David Ignatius of The Washington Post and Feisal Istrabadi, Iraq’s former deputy UN ambassador, about the complicated challenges facing the U.S.