The Washington Post reports this weekend that Kayla Mueller, an American held hostage by ISIS and killed back in February of this year, was kept as a sex slave by the perverted deviant in charge of the terror group, Abu Bakr al-Baghdadi. The family of Kayla Mueller said in an interview Friday that the FBI had informed them that Abu Bakr al-Baghdadi, the emir of the self-proclaimed Islamic State, had sexually abused their daughter, a humanitarian worker.Mueller’s parents said the FBI first spoke to the family about the sexual assault in late June and provided more details two weeks ago....