U.S. Olympic swimmers Gunnar Bentz and Jack Conger walk to the airport police station office at Rio's international airport in this still frame taken from video dated August 17, 2016, in Rio De Janeiro, Brazil. GLOBO TV/via REUTERS TV

A basketball court is pictured in a former Peloponnese tourist resort that has been turned into a migrant home near the town of Myrsini, southwest of Athens, Greece, August 13, 2016. Picture taken August 13, 2016. REUTERS/Michele Kambas

2016 Rio Olympics - Athletics - Final - Women's 100m Hurdles Final - Olympic Stadium - Rio de Janeiro, Brazil - 17/08/2016. Gold medallist Brianna Rollins (USA) of USA (C), silver medallist Nia Ali (USA) of USA (R) and bronze medallist Kristi Castlin (USA) of USA (L) hold up the U.S. flag. REUTERS/Lucy Nicholson

James Feigen of the U.S. poses with his silver medal at the men's 100m freestyle victory ceremony during the World Swimming Championships at the Sant Jordi arena in Barcelona August 1, 2013. Feigen was among three US Olympic swimmers stopped from boarding a flight in Rio de Janeiro on August 17, 2016. REUTERS/Albert Gea/Files

2016 Rio Olympics - Swimming - Final - Men's 200m Individual Medley Final - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 11/08/2016. Ryan Lochte (USA) of USA reacts. REUTERS/David Gray

2016 Rio Olympics - Athletics - Semifinal - Men's 200m Semifinals - Olympic Stadium - Rio de Janeiro, Brazil - 17/08/2016. Justin Gatlin (USA) of USA reacts. REUTERS/Alessandro Bianchi

2016 Rio Olympics - Athletics - Semifinal - Men's 200m Semifinals - Olympic Stadium - Rio de Janeiro, Brazil - 17/08/2016. (From L) Andre De Grasse (CAN) of Canada, Usain Bolt (JAM) of Jamaica and Salem Eid Yaqoob (BRN) of Bahrain compete. REUTERS/Lucy Nicholson

2016 Rio Olympics - Athletics - Final - Women's Long Jump Final - Olympic Stadium - Rio de Janeiro, Brazil - 17/08/2016. Tianna Bartoletta (USA) of USA celebrates winning the gold medal. REUTERS/Alessandro Bianchi