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U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington September 12, 2014. In 1993, Clinton signed the bill that created AmeriCorps.

Kevin Lamarque/Reuters

U.S. President Barack Obama and former President Bill Clinton walk past the Rose Garden to host an event marking the 20th anniversary of the national service program AmeriCorps at the White House in Washington

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington, Thursday, Sept. 11, 2014, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks.

Charles Dharapak/AP

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and others, stand on the South Lawn of the White House in Washington on Thursday, as they observe a moment of silence to mark the 13th anniversary of the 9/11 attacks

Anti-government protesters take shelter under plastic sheet during heavy rain in morning, in front of President's house in the Red Zone during the Revolution March in Islamabad...Anti-government protesters take shelter under a plastic sheet during heavy rain in the morning, in front of the President's house in the Red Zone during the Revolution March in Islamabad September 4, 2014. Pakistan's protest leaders demanding Prime Minister Nawaz Sharif's resignation prepared to resume talks with the government on Wednesday, reviving hopes for a negotiated solution to a crisis that has shaken the coup-prone nation.

Zohra Bensemra/Reuters

Anti-government protesters take shelter under a plastic sheet during heavy morning rain in front of the president’s house in the army guarded ‘red zone’, Islamabad

Russian President Vladimir Putin (L) shakes hands with his Ukrainian counterpart Petro Poroshenko, as Kazakh President Nursultan Nazarbayev (C) stands nearby, in Minsk August 26, 2014.

Sergei Bondarenko/Reuters

Russian President Vladimir Putin shakes hands with his Ukrainian counterpart Petro Poroshenko, as Kazakh President Nursultan Nazarbayev stands nearby, in Minsk

Portugal Day, Camoes and Portuguese Comunities cerimonies....epa04247622 Portuguese President Anibal Cavaco Silva (2-L), is helped by security and staff members after feeling unwell during his speech at ceremonies for the June 10, Portugal Day, to Camoes and Portuguese Comunities, in Guarda, northern Portugal, 10 June 2014. A few minutes later, Cavaco Silva returns to finish his speech.

Paulo Novais/EPA

Portuguese President Anibal Cavaco Silva is helped by security and staff members after feeling unwell during his speech at ceremonies for Portugal Day in Guarda, northern Portugal

A supporter of Afghan presidential candidate Zalmai Rassoul carries chairs as he prepares for an election rally in Panshir, northern Afghanistan, March 28, 2014. Afghan presidential elections will be held on April 5.

Zohra Bensemra/Reuters

A supporter of Afghan presidential candidate Zalmai Rassoul carries chairs as he prepares for an election rally in Panshir, northern Afghanistan. Afghan presidential elections will be held on April 5.

Soldiers march out of the Great Hall of the People before a welcome ceremony held by Chinese President Xi Jinping for visiting Pakistani President Mamnoon Hussain (both not seen), in Beijing, China, 19 February 2014. The Pakistani president is on an official visit in China; his first foreign trip since taking office.

Alexander F. Yuan/EPA

Soldiers march out of the Great Hall of the People, Beijing, China, before a welcome ceremony held by Chinese president Xi Jinping for visiting Pakistani president Mamnoon Hussain. Mr Hussain is on an official visit to China, his first foreign trip since taking office

US President Barack Obama attends the National Prayer Breakfast in Washington, DC, on February 6, 2014.

Jewel Samad/AFP

US President Barack Obama endorses the National Day of Prayer by attending the celebratory breakfast in Washington, DC, on Thursday

France's President Francois Hollande (L) and Brazil's President Dilma Rousseff attend a welcoming ceremony at the Planalto Palace in Brasilia December 12, 2013.

Ueslei Marcelino/Reuters

France’s President Fran├žois Hollande and Brazil’s President Dilma Rousseff attend a welcoming ceremony at the Planalto Palace in Brasilia

U.S. first lady Obama and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington...U.S. first lady Michelle Obama (R) and her daughters Sasha and Malia welcome the official White House Christmas tree at the North Portico of the White House in Washington November 29, 2013. The 18.5-foot Douglas Fir was grown by Chris Botek, a second generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania.    REUTERS/Jason Reed

Jason Reed/Reuters

Michelle Obama, US first lady, and her daughters Sasha and Malia welcome the official White House Christmas tree to the White House in Washington. The 18.5ft Douglas Fir was grown by Chris Botek, a second-generation Christmas tree farmer from Crystal Spring Tree Farm in Lehighton, Pennsylvania. Read more