What we know about Iranian attacks on U.S. bases in Iraq

Early Wednesday, Iran’s Revolutionary Guard launched 15 ballistic missiles at air bases in Iraq that house American troops -- a remarkable step as it came directly from the Islamic Republic rather than its network of proxies. Nick Schifrin joins Judy Woodruff and gets analysis from Mara Karlin of the Johns Hopkins School of Advanced International Studies and the Hudson Institute’s Michael Doran.