Witold Banka, president of the World Anti-Doping Agency (WADA), speaks out amid a feud with American anti-doping officials. Tensions spiked this year after reports in April said 23 Chinese swimmers had tested positive for a banned substance ahead of the 2021 Tokyo Olympics, but were cleared to compete at the Games. The US Anti-Doping Agency (USADA) has consistently accused WADA of covering up the cases, which China blamed on unintentional food contamination. IMAGES AND SOUNDBITES TO COMPLETE VIDI364V3NG_EN