Former CIA Director David Petraeus said in a new interview that the rise of the Islamic State was “well known” among people monitoring the situation within the U.S. government, and that it was able to flourish amid the chaos of the civil war in Syria. “ISIS in a sense is the evolution of an organization that we did defeat, Al Qaeda in Iraq,” Petraeus told the Pittsburgh Post-Gazette in an interview published Monday. “Some of the very hard work we did to help re-establish the fabric of Iraqi society — to bring the Sunni Arabs back into Iraqi society and...