U.S. Vice President Joe Biden delivers a speech in Riga, Latvia, August 23, 2016. REUTERS/Ints Kalnins

Turkish President Recep Tayyip Erdogan looks down during the Refugee Summit at the United Nations in New York September 20, 2016. REUTERS/Kevin Lamarque

Turkish President Recep Tayyip Erdogan enters the General Assembly Hall to speak during the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Eduardo Munoz

Turkish President Recep Tayyip Erdogan addresses the United Nations General Assembly in the Manhattan borough of New York, U.S. September 20, 2016. REUTERS/Eduardo Munoz

Turkish President Recep Tayyip Erdogan addresses the United Nations General Assembly in the Manhattan borough of New York, U.S. September 20, 2016. REUTERS/Eduardo Munoz

U.S. President Barack Obama greets Chilean president Michelle Bachelet as he arrives for a luncheon during the United Nations General Assembly at United Nations headquarters in New York City, U.S. September 20, 2016. REUTERS/Lucas Jackson

U.S. President Barack Obama (R) greets British Prime Minister Theresa May as he arrives for a luncheon during the United Nations General Assembly at United Nations headquarters in New York City, U.S. September 20, 2016. REUTERS/Lucas Jackson

U.S. President Barack Obama (C) greets Ukraine's President Petro Poroshenko as they arrive for a luncheon during the United Nations General Assembly at United Nations headquarters in New York City, U.S. September 20, 2016. REUTERS/Lucas Jackson