2016 Rio Olympics - Athletics - Final - Men's Shot Put Final - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Ryan Crouser (USA) of USA reacts. REUTERS/Kai Pfaffenbach

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

U.S. Olympic swimmers Jack Conger and Gunnar Bentz check in at the international airport to board a flight back to the U.S. after spending the day being interrogated by police in Rio de Janeiro, August 18, 2016. REUTERS/Ueslei Marcelino

2016 Rio Olympics - Swimming - Preliminary - Men's 200m Individual Medley - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 10/08/2016. Ryan Lochte (USA) of USA REUTERS/Michael Dalder FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS.

2016 Rio Olympics - Athletics - Preliminary - Women's 4 x 100m Relay Round 1 - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Veronica Campbell-Brown (JAM) of Jamaica passes the baton to teammate Shelly-Ann Fraser-Pryce (JAM) of Jamaica as Dina Asher-Smith (GBR) of Britain passes it to her teammate Darryl Neita (GBR) of Britain. REUTERS/Fabrizio Bensch

2016 Rio Olympics - Athletics - Preliminary - Women's 4 x 100m Relay Round 1 re-run - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Allyson Felix (USA) of USA, English Gardner (USA) of USA and Morolake Akinosun (USA) of USA walk on the track. REUTERS/Dominic Ebenbichler

2016 Rio Olympics - Athletics - Preliminary - Women's 4 x 100m Relay Round 1 re-run - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Tianna Bartoletta (USA) of USA and Allyson Felix (USA) of USA compete. REUTERS/Dominic Ebenbichler

2016 Rio Olympics - Athletics - Preliminary - Women's 4 x 100m Relay Round 1 re-run - Olympic Stadium - Rio de Janeiro, Brazil - 18/08/2016. Allyson Felix (USA) of USA and Tianna Bartoletta (USA) of USA compete. REUTERS/David Gray