How this Iran-backed militia helped save Iraq from ISIS

In 2014, when most U.S. ground forces were gone and Iraqi forces were too weak, the threat of ISIS in Iraq spawned the PMF, a government-sanctioned militia that was armed, funded and trained by Iran, America's long-time foe. In the second installment of our series “Iran Rising in Iraq,” special correspondent Reza Sayah reports in partnership with the Pulitzer Center on Crisis Reporting.