How ISIL's bid for a new caliphate taps historical yearning

Aired: 7/1/2014 | 0:04:23 | Clip
How does ISIL's declaration of a new Islamic state complicate the military and political problems already challenging the Iraqi government? Chief foreign correspondent Margaret Warner joins Judy Woodruff to examine the history of the term “caliphate” and what threats ISIL poses across the region.