The Secretary General of the United Nations Ban Ki-moon wears a Refugee Olympic Team hat as a show of support during a photo call at United Nations Headquarters in the Manhattan borough New York, U.S., August 3, 2016. REUTERS/Carlo Allegri

2016 Rio Olympics - Shooting - Final - Men's Skeet Finals - Olympic Shooting Centre - Rio de Janeiro, Brazil - 13/08/2016. Abdullah Alrashidi (KUW) of Independent Olympic Athlete reacts. REUTERS/Edgard Garrido

2016 Rio Olympics - Shooting - Victory Ceremony - Women's 10m Air Rifle Victory Ceremony - Olympic Shooting Centre - Rio de Janeiro, Brazil - 06/08/2016. Virginia Thrasher (USA) of USA waves after winning the gold medal. REUTERS/Edgard Garrido

2016 Rio Olympics - Shooting - Preliminary - Men's 50m Rifle 3 Positions Qualification - Olympic Shooting Centre - Rio de Janeiro, Brazil - 14/08/2016. Matthew Emmons (USA) of USA competes. REUTERS/Edgard Garrido

2016 Rio Olympics - Shooting - Final - Men's 50m Rifle 3 Positions Finals - Olympic Shooting Centre - Rio de Janeiro, Brazil - 14/08/2016. Niccolo Campriani (ITA) of Italy celebrates after winning the gold medal. REUTERS/Edgard Garrido

2016 Rio Olympics - Athletics - Final - Men's 100m Final - Olympic Stadium - Rio de Janeiro, Brazil 14/08/2016. Justin Gatlin (USA) of USA reacts after the race REUTERS/Dylan Martinez

2016 Rio Olympics - Athletics - Final - Men's 100m Final - Olympic Stadium - Rio de Janeiro, Brazil - 14/08/2016. Justin Gatlin (USA) of USA celebrates winning the silver medal. REUTERS/Lucy Nicholson

2016 Rio Olympics - Athletics - Final - Men's 100m Final - Olympic Stadium - Rio de Janeiro, Brazil 14/08/2016. Justin Gatlin (USA) of USA reacts after the race REUTERS/Dylan Martinez