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US President Donald Trump speaks during the Arab Islamic American Summit in Riyadh, May 21, 2017 (MANDEL NGAN/AFP/Getty Images)

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Police and Military presence seen outside Buckingam Palace on May 24, 2017 in London, England (Jack Taylor/Getty Images)

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NATO Secretary General Jens Stoltenberg's soeajs during the unveiling ceremony of the Berlin Wall monument, during the NATO summit in Brussels, May 25, 2017 (EMMANUEL DUNAND/AFP/Getty Images)

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North Korea's ballistic missile, North Korea Victory Day, 2013 (Stefan Krasowski)

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Video screenshot of President Trump as delivered his speech at the Arab Islamic American Summit Riyadh on May 21, 2017 (Whitehouse.gov)

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Michel Temer in his first ministerial meeting as acting president of Brazil, May 13, 2016 (José Cruz/Agência Brasil)

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Saudi Arabia's King Salman bin Abdulaziz Al Saud and U.S. President Donald Trump join dancers with swords at Murabba Palace in Riyadh, Saudi Arabia, May 20, 2017 (Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

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U.S. President Donald Trump holds a joint press conference with German Chancellor Angela Merkel, March 17, 2017 (Justin Sullivan/Getty Images)

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US President Donald Trump and First Lady Melania Trump disembark Air Force One upon their arrival at Ben Gurion International Airport in Tel Aviv on May 22, 2017 (JACK GUEZ/AFP/Getty Images)

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A telescope at the quantum communication ground station in Xinglong, north China's Hebei Province, January 18, 2017 (Xinhua/Jin Liwang via Getty Images)