Egyptian President Mohammed Morsi (center) is flanked by Field Marshal Hussein Tantawi (left) and Chief of Staff Sami Anan at a ceremony at an Air Force base in Cairo on Tuesday. U.S. Secretary of State Hillary Rodham Clinton arrives in the Egyptian capital on Saturday amid growing concern in Washington that a power struggle in Egypt could imperil the transition to democratic rule. (Associated Press)

Egyptian President Mohammed Morsi (center) is flanked by Field Marshal Hussein Tantawi (left) and Chief of Staff Sami Anan at a ceremony at an Air Force base in Cairo on Tuesday. U.S. Secretary of State Hillary Rodham Clinton arrives in the Egyptian capital on Saturday amid growing concern in Washington that a power struggle in Egypt could imperil the transition to democratic rule. (Associated Press)