Protesters and family members of 9/11 victims hold placards in front of the White House regarding President Barack Obama's threatened veto of the Justice Against Sponsors of Terrorism Act (JASTA) in Washington, U.S., September 20, 2016. REUTERS/Gary Cameron

Prime Minister Alexis Tsipras of Greece listens as U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri

President Nicos Anastasiades of Cyprus listens as U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri

President Recep Tayyip Erdogan of Turkey listens as U.S. President Barack Obama addresses the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Lucas Jackson

Russian Foreign Minister Sergei Lavrov (R) confers with members of his delegation as U.S. President Barack Obama speaks during the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Lucas Jackson

President Recep Tayyip Erdogan of Turkey speaks with his Foreign Minister Mevlut Cavusoglu (L) as U.S. President Barack Obama speaks during the 71st United Nations General Assembly in Manhattan, New York, U.S. September 20, 2016. REUTERS/Lucas Jackson

Members of the Syrian delegation listen as U.S. President Barack Obama addresses the United Nations General Assembly in New York September 20, 2016. REUTERS/Kevin Lamarque

Former Brazilian President Luiz Inacio Lula da Silva arrives to a news conference with international media in Sao Paulo, Brazil, March 28, 2016. REUTERS/Paulo Whitaker