When Iraqi tribal leaders came to D.C. looking for help against ISIL, the White House refused. Then the former president made a call. Late in the evening of Sunday, January 18, an eleven-member delegation of tribal leaders from Iraq’s western Anbar Province arrived in Washington, D.C. Just as their plane was touching down, Islamic State units back in Iraq attacked the compound of one of the delegation’s senior leaders, Sheik Ahmed Abu Risha, killing nine Iraqi police officers and wounding 28 of the sheik’s guards. A nearby Iraqi military unit failed to respond to repeated calls for help. The brutal...