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HMAS Melbourne conducting Maritime security Operations in the Persian Gulf and Indian Ocean. (Handout/Royal Australian Navy)

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Russian President Vladimir Putin and Chinese President Xi Jinping during the Asia-Pacific Economic Cooperation (APEC) summit on November 9, 2014 in Beijing, China. (How Hwee Young - Pool/Getty Images)

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Voting booths are set up for early voting at the Black Hawk County Courthouse on September 27, 2012 in Waterloo, Iowa. (Scott Olson/Getty Images)

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Candles burn above a poster of Albert Nisman following a 'Silent March' on February 18, 2015 in Buenos Aires, Argentina. (Mario Tama/Getty Images)

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The official seal of the Federal Bureau of Investigation is seen on an iPhone's camera screen outside the J. Edgar Hoover headquarters, February 23, 2016 in Washington, DC. (Chip Somodevilla/Getty Images)