Attorney General Eric Holder waves to the audience as he is introduced before speaking at the Northwestern University law school, Monday, March 5, 2012 in Chicago. Holder said Monday that the decision... more 
Attorney General Eric Holder waves to the audience as he is introduced before speaking at the Northwestern University law school, Monday, March 5, 2012 in Chicago. Holder said Monday that the decision to kill a U.S. citizen living abroad who poses a terrorist threat "is among the gravest that government leaders can face," but justified lethal action as legal and sometimes necessary in the war on terror. (AP Photo/Brian Kersey) less 
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Associated Press | Photo By Brian Kersey
Mon, Mar 5, 2012 5:35 PM EST