2016 Rio Olympics - Swimming - Men's 4 x 200m Freestyle Relay - Olympics Aquatics Stadium - Rio de Janeiro, Brazil - 09/08/2016. Michael Phelps (USA) of USA wears an "MP" branded cap before the start of the 4 X 200m freestyle relay race. Picture taken August 9, 2016. REUTERS/Michael Dalder

2016 Rio Olympics - Cycling Road - Final - Women's Road Race - Fort Copacabana - Rio de Janeiro, Brazil - 07/08/2016. Mara Abbott (USA) of USA leads ahead of Annemiek van Vleuten (NED) of Netherlands REUTERS/Eric Gaillard

President Barack Obama smiles after putting on the first green at Farm Neck Golf Club during his annual summer vacation on Martha's Vineyard, in Oak Bluffs, Massachusetts, August 7, 2016. REUTERS/Jonathan Ernst

U.S. President Barack Obama reacts after missing a putt on the first green at the Farm Neck Golf Club at Oak Bluffs on Marthas Vineyard, August 11, 2013. REUTERS/Larry Downing/File Photo

Spectators rest outside the Olympic Tennis Center at the Rio 2016 Olympic Games in Rio de Janeiro, August 9, 2016. Picture taken August 9, 2016. REUTERS/Paulo Prada

Spectators rest outside the Olympic Tennis Center at the Rio 2016 Olympic Games in Rio de Janeiro, August 9, 2016. Picture taken August 9, 2016. REUTERS/Paulo Prada

Spectators rest outside the Olympic Tennis Center at the Rio 2016 Olympic Games in Rio de Janeiro, August 9, 2016. Picture taken August 9, 2016. REUTERS/Paulo Prada

Renault Chief Executive Carlos Ghosn (2ndR), Renault Formula One racing driver Kevin Magnussen of Denmark (R) and teammate Jolyon Palmer of Britain (2ndL), and reserve driver Esteban Ocon (L) pose during the official presentation of the new Renault RS16 car at the company's research center, the Technocentre, in Guyancourt, near Paris, France, February 3, 2016. REUTERS/Benoit Tessier