In a bipartisan letter sent to the World Anti-Doping Agency (WADA), U.S. members of Congress criticized WADA for opening an investigation into the leak that revealed 23 Chinese swimmers had tested positive for performance enhancers before the 2021 Tokyo Olympics. The letter maintained that this investigation would attack whistleblowers and intimidate individuals. The letter was signed by Senators Marsha Blackburn (R-Tennessee) and Chris van Hollen (D-Maryland) and Reps. John