U.S. President Donald Trump salutes a member of the military (not seen in photo) who had just sung the U.S. national anthem as he stands with a performer in an Easter Bunny costume at the White House Easter Egg Roll on the Truman Balcony of the White House in Washington, U.S., April 17, 2017. REUTERS/Joshua Roberts

Supporters of Turkish President Tayyip Erdogan wave national flags during a rally for the upcoming referendum in Konya, Turkey, April 14, 2017. REUTERS/Umit Bektas

Photographers take pictures as the Soyuz MS-04 spacecraft carrying the crew of Jack Fischer of the U.S. and Fyodor Yurchikhin of Russia blasts off to the International Space Station (ISS) from the launchpad at the Baikonur Cosmodrome, Kazakhstan, April 20, 2017. REUTERS/Shamil Zhumatov

Men share an ice-cream in Pyongyang, North Korea April 16, 2017. REUTERS/Damir Sagolj

Ameen Mukdad, a violinist from Mosul who lived under ISIS's rule for two and a half years where they destroyed his musical instruments, performs at Nabi Yunus shrine in eastern Mosul, Iraq, April 19, 2017. REUTERS/ Muhammad Hamed - RTS12ZBM

Soap bubbles float past St Paul's Cathedral in central London, Britain April 17, 2017. REUTERS/Stefan Wermuth

An opposition demonstrator blocks the way of an armored car as riot police clashes with demonstrators during the so-called "mother of all marches" against Venezuela's President Nicolas Maduro in Caracas, Venezuela April 19, 2017. REUTERS/Marco Bello

People cheer as a missile is driven past the stand with North Korean leader Kim Jong Un and other high ranking officials during a military parade marking the 105th birth anniversary of country's founding father Kim Il Sung, in Pyongyang April 15, 2017. REUTERS/Damir Sagolj

An injured demonstrators is been helped by another protester after clashing with riot police during the so-called "mother of all marches" against Venezuela's President Nicolas Maduro in Caracas, Venezuela April 19, 2017. REUTERS/Carlos Garcia Rawlins