Secretary of State Hillary Rodham Clinton speaks with reporters aboard her aircraft on her way from Paris to Cairo on Tuesday, March 15, 2011. Mrs. Clinton was expected to press Egypt's transitional leaders to follow through on pledges for democratic reform after the ouster of longtime autocratic President Hosni Mubarak in a popular revolt. (AP Photo/Paul J. Richards, Pool)
Secretary of State Hillary Rodham Clinton arrives at Le Bourget Airport north of Paris on Monday, March 14, 2011, for talks with European and other leaders on the crisis in Libya. (AP Photo/Paul J Richards, Pool)
Secretary of State Hillary Rodham Clinton testifies before the House Appropriations subcommittee on State, foreign operations and related programs on Capitol Hill in Washington on Thursday, March 10, 2011. (AP Photo/Jose Luis Magana)
FILE - In this March 1, 2011 file photo, Secretary of State Hillary Rodham Clinton testifies on Capitol Hill in Washington before the House Foreign Affairs Committee. (AP Photo/J. Scott Applewhite, file)
Secretary of State Hillary Rodham Clinton (center) is welcomed on Capitol Hill in Washington on Wednesday, March 2, 2011, by Sen. Barbara Boxer (left) and Sen. Richard G. Lugar (right) as she arrives to testify on America's foreign policy priorities before the Senate Foreign Relations Committee. Sen. Bob Corker walks behind Mrs. Clinton. (AP Photo/J. Scott Applewhite)
Secretary of State Hillary Rodham Clinton testifies before the House Foreign Affairs Committee in Washington on Tuesday, March 1, 2011. (AP Photo/J. Scott Applewhite)
Secretary of State Hillary Rodham Clinton speaks to the Human Rights Council in Geneva on Monday. The 27-nation bloc agreed on sanctions against Libya. (Associated Press)
President Obama speaks about the uprising in Libya with Secretary of State Hillary Rodham Clinton present in the Grand Foyer of the White House on Wednesday. (Associated Press)
Secretary of State Hillary Rodham Clinton delivers her speech on "Internet Rights And Wrongs: Choices & Challenges In A Networked World" Tuesday, Feb. 15, 2011, at George Washington University in Washington. (AP Photo/Manuel Balce Ceneta)
U.S. Secretary of State Hillary Rodham Clinton meets German Foreign Minister Guido Westerwelle during the Conference on Security Policy in Munich on Saturday, Feb. 5, 2011. (AP Photo/Frank Augstein)
Secretary of State Hillary Rodham Clinton boards a plane at Andrews Air Force Base outside Washington for a trip to Haiti on Sunday, Jan. 30, 2011. (AP Photo/Alex Brandon, Pool)
From left; President Barack Obama meets Michaele Salahi, President Bush and first lady Laura Bush, first lady Hillary Rodham Clinton dances with Argentine President Carlos Menem and (background) Mexico President Vicente Fox saw fireworks at his White House visit. (Photos: Associated Press and The Washington Times)
Chinese President Hu Jintao shares a toast with Vice President Joseph R. Biden Jr. and Secretary of State Hillary Rodham Clinton during a luncheon in Mr. Hu's honor at the State Department on Wednesday. (Associated Press)
** FILE ** Secretary of State Hillary Rodham Clinton arrives at the Forum for the Future conference in Doha, Qatar, on Thursday, Jan. 13, 2011. Mrs. Clinton said at the meeting that the foundations of development and progress in the Middle East were "sinking into the sand" and would continue to do so unless reforms were enacted. (AP Photo/Tara Todras-Whitehill)
Secretary of State Hillary Rodham Clinton speaks about China on Friday, Jan. 14, 2011, at the State Department in Washington. (AP Photo/Charles Dharapak)
Secretary of State Hillary Rodham Clinton speaks about China, Friday, Jan. 14, 2011, at the State Department in Washington. (AP Photo/Charles Dharapak)
Secretary of State Hillary Rodham Clinton talks at the Forum for the Future conference in Doha, Qatar, Thursday, Jan.13, 2011. (AP Photo/Tara Todras-Whitehill)
Yemeni President Ali Abdullah Saleh greets Secretary of State Hillary Rodham Clinton as she arrives at the presidential palace in Sanaa, Yemen, on Tuesday. Mrs. Clinton's unannounced visit aimed to shore up ties with a fragile and problematic ally. (Associated Press)
Yemeni President Ali Abdullah Saleh, right, walks with Secretary of State Hillary Rodham Clinton, as she arrives at the Presidential Palace in Sanaa, Yemen, Tuesday, Jan. 11, 2011. (AP Photo/Hani Mohammed)
Secretary of State Hillary Rodham Clinton leaves the Zabeel Palace after her meeting with Sheik Mohammad bin Rashid Al Maktoum, prime minister of the United Arab Emirates and ruler of Dubai, in Dubai, United Arab Emirates, Monday Jan. 10, 2011. (AP Photo/Kamran Jebreili)