Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - The face of a balding, middle-aged man stares unsmilingly into the camera. He is dressed in a suit and tie and could pass for a mid-level bureaucrat.
But the photograph is that of Abu Bakr al Baghdadi, who has transformed a few terror cells harried to the verge of extinction into the most dangerous militant group in the world.
The Islamic State in Iraq and Syria (ISIS) has thrived and mutated in the security vacuum that followed the departure of the last U.S. forces from Iraq and the civil war in Syria.