Pentagon Sees IS as a Potent Force After Caliphate Declaration

It's been a year since Islamic State declared a caliphate on territory seized in Iraq and Syria. Now, the al Qaeda splinter group faces military pressure from a U.S.-led coalition. The Pentagon said on Monday that IS still remains a potent force holding key cities. Defense Department spokesman Colonel Steve Warren said the militant group has lost a quarter of the land it controlled at the height of its expansion. It has also broken and run on several occasions in northern Syria, in the face of an offensive by Kurdish-led forces.