US Defense Secretary Mark Esper calls al-Baghdadi's death a "devastating blow" to an organization that already had lost its hold on a wide swath of territory in Syria and Iraq. Esper gives his remarks on the successful raid, resulting in the death of the founder and leader of ISIS.  Alongside Gen. Mark Milley, chairman of the Joint Chiefs of Staff, at a Pentagon news conference on Monday to congratulate the mission by U.S. special operations forces that happened on Saturday night.