A model presents a creation at the Prada fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 22, 2016. REUTERS/Alessandro Garofalo

Models present creations at the Prada fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 22, 2016. REUTERS/Max Rossi

A model presents a creation at the Prada fashion show during Milan Fashion Week Spring/Summer 2017 in Milan, Italy, September 22, 2016. REUTERS/Alessandro Garofalo

T-shirts with the image of Martin Luther King and with the words "I can't breathe" are pictured for sale during a Martin Luther King day rally in the Harlem section of New York January 19, 2015. REUTERS/Carlo Allegri

Traders work on the floor of the New York Stock Exchange (NYSE) in New York City, U.S. September 22, 2016. REUTERS/Brendan McDermid

Gjorge Ivanov, President of Macedonia, prepares to address the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

Gjorge Ivanov, President of Macedonia, addresses the 71st session of the United Nations General Assembly at the UN headquarters in New York on September 22, 2016. / AFP PHOTO / DOMINICK REUTERDOMINICK REUTER/AFP/Getty Images

Gabon's President Ali Bongo Ondimba addresses the media at Nairobi National Park near Nairobi, Kenya, April 30, 2016. REUTERS/Thomas Mukoya