U.S. Olympic swimmers Jack Conger and Gunnar Bentz arrive at the Miami international airport from Rio de Janeiro a day after Brazilian police detained their passports and questioned them, in Miami August 19, 2016. REUTERS/Cassandra Garrison

U.S. Olympic swimmers Jack Conger and Gunnar Bentz arrive at the Miami international airport from Rio de Janeiro a day after Brazilian police detained their passports and questioned them, in Miami August 19, 2016. REUTERS/Cassandra Garrison

U.S. Olympic swimmers Jack Conger and Gunnar Bentz arrive at the Miami international airport from Rio de Janeiro a day after Brazilian police detained their passports and questioned them, in Miami August 19, 2016. REUTERS/Cassandra Garrison

2016 Rio Olympics - Athletics - Final - Men's Decathlon 1500m - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Ashton Eaton (USA) of USA celebrates winning the gold medal. REUTERS/Alessandro Bianchi

Security video shows three U.S. Olympic swimmers returning from a bathroom to their taxi at a gasoline station where they were accused by staff of having caused damage, in Rio de Janeiro. Courtesy Globo TV/Handout via Reuters

2016 Rio Olympics - Athletics - Final - Men's 200m Final - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. First placed Usain Bolt (JAM) of Jamaica celebrates. REUTERS/David Gray

2016 Rio Olympics - Athletics - Final - Men's 200m Final - Olympic Stadium - Rio de Janeiro, Brazil -18/08/2016. Usain Bolt (JAM) of Jamaica celebrates after winning gold REUTERS/Dylan Martinez

2016 Rio Olympics - Athletics - Final - Men's 200m Final - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Usain Bolt (JAM) of Jamaica (C) runs to win the gold. REUTERS/Lucy Nicholson TPX IMAGES OF THE DAY.