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Republican presidential candidate Sen. Marco Rubio (R-FL) speaks to guests during a rally on January 6, 2016 in Marshalltown, Iowa. (Scott Olson/Getty Images)

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Palestinian Islamic Jihad militants take part in an anti-Israel rally in the town of Rafah in the southern Gaza Strip on December 18, 2015. (SAID KHATIB/AFP/Getty Images)

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A Russian biker shows a banner depicting Joseph Stalin and reading a WWII slogan 'For the Motherland! For Stalin!' in Moscow on April 25, 2015. (DMITRY SEREBRYAKOV/AFP/Getty Images)

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Military personnel arrive in a Chinook before Iraqi soldiers take part in a live-fire exercise for under the surveillance of US-led coalition forces at Basmaya base, Iraq on January 27, 2016. (AHMAD AL-RUBAYE/AFP/Getty Images)

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The podium before 2012 Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at his final campaign rally at Verizon Wireless Arena on November 5, 2012 in Manchester, New Hampshire. (Justin Sullivan/Getty Images)

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Russia's Prime Minister Vladimir Putin during a congress of the ruling United Russia party in Moscow, on September 23, 2011. (NATALIA KOLESNIKOVA/AFP/Getty Images)

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U.S. President Barack Obama, with U.S. Secretary of State John Kerry (R), at the White House November 6, 2015 in Washington, DC. (Mark Wilson/Getty Images)

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A syringe used for intravenous drug use lies on a table in a room on February 6, 2014 in St. Johnsbury, Vermont. (Spencer Platt/Getty Images)