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FILE - In this Sunday, June 10, 2012 file photo, Assistant Secretary of State for African Affairs Johnnie Carson, center, speaks with U.S. Ambassador to Kenya Scott Gration, left, at a hotel in Nairobi, Kenya shortly after Carson returned from a trip to Mogadishu, Somalia. The U.S. ambassador to Kenya Scott Gration said Friday, June 29, 2012 that he is leaving his post over differences with Washington on his leadership style, adding that he resigned Monday, June 25, 2012, effective Saturday, July 28, 2012. (AP Photo/Jason Straziuso, File)

Associated Press
FILE - In this Sunday, June 10, 2012 file photo, Assistant Secretary of State for African Affairs Johnnie Carson, center, speaks with U.S. Ambassador to Kenya Scott Gration, left, at a hotel in Nairobi, Kenya shortly after Carson returned from a trip to Mogadishu, Somalia. The U.S. ambassador to Kenya Scott Gration said Friday, June 29, 2012 that he is leaving his post over differences with Washington on his leadership style, adding that he resigned Monday, June 25, 2012, effective Saturday, July 28, 2012. (AP Photo/Jason Straziuso, File)
FILE - In this Sunday, June 10, 2012 file photo, Assistant Secretary of State for African Affairs Johnnie Carson, center, speaks with U.S. Ambassador to Kenya Scott Gration, left, at a hotel in Nairobi, Kenya shortly after Carson returned from a trip to Mogadishu, Somalia. The U.S. ambassador to Kenya Scott Gration said Friday, June 29, 2012 that he is leaving his post over differences with Washington on his leadership style, adding that he resigned Monday, June 25, 2012, effective Saturday, July 28, 2012. (AP Photo/Jason Straziuso, File)
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