If the president fails, L.A. will likely get the Games four years later.
A report found up to half of anti-doping tests could not be completed.
International Olympic Committee agrees to give WADA an expanded role in the wake of international doping scandals.
Several top athletes' medical data appeared on a hackers' website.
Politics, partying and Parkour: How Brazil welcomed the world to Rio 2016.
The International Olympic Committee has faced widespread criticism for not barring Russia after proof of pervasive doping program.
The former world no. 1 golfer believes the IOC has abandoned athletes.
Individual athletes' participation will be up to each sports federation.
A petition for the sport to be included in the Olympic Games has been launched.
Social media and guerrilla marketing complicates the International Olympic Committee's efforts to protect nearly $1 billion in deals.
The short answer is, 'Almost certainly not.'
British Olympians are reported to be worried about the disease with the Rio Olympics approaching.
The World Health Organization has declared a global emergency but Olympics chiefs remain unruffled.
"Flying disc" sports are now recognized by the IOC, but prime-time glory is not guaranteed.