U.S. Secretary of State John Kerry shakes hands with Israeli Prime Minister Benjamin Netanyahu in Tel Aviv on July 23. While the two countries are close allies, they have exchanged criticism during the recent Israel-Hamas fighting in Gaza. Pool/AFP/Getty Images hide caption

itoggle caption Pool/AFP/Getty Images

President Obama listens as Chinese President Xi Jinping answers a question after a bilateral meeting in California on June 7. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

A rebel fighter takes cover inside a damaged building in the eastern Syrian city of Deir al-Zor on Tuesday. The U.S. is training a small number of rebels and has pledged to provide them with arms. Khalil Ashawi/Reuters/Landov hide caption

itoggle caption Khalil Ashawi/Reuters/Landov

A protester denounces President Obama during a march near Cairo's Tahrir Square on July 7. Bitter rivals in Egypt tend to be united in opposition to the U.S. government, which has been a leading aid donor to the country for decades. Gianluigi Guercia/AFP/Getty Images hide caption

itoggle caption Gianluigi Guercia/AFP/Getty Images

The flag of Libya's National Transitional Council (second from right) flies outside the United Nations headquarters building in New York. Stan Honda/AFP/Getty Images hide caption

itoggle caption Stan Honda/AFP/Getty Images

President Obama and other members of his national security team monitored the mission that ended with the death of Osama bin Laden in May 2011. Pete Souza/White House hide caption

itoggle caption Pete Souza/White House