File photo of National Security Advisor Susan Rice attends the March on Washington commemoration ceremony in Washington
U.S. National Security Advisor Susan Rice looks up during the commemoration ceremony for the 50th anniversary of the March on Washington and Rev. Martin Luther King Jr.'s I have a dream speech at the Lincoln Memorial in Washington in this August 28, 2013 file photo. Susan Rice is facing her first key test as President Barack Obama's national security adviser as she helps lead a White House effort to convince a skeptical Congress that the United States must respond to Syria's apparent use of chemical weapons. REUTERS/Kevin Lamarque/Files (UNITED STATES - Tags: POLITICS)
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