German Minister of the Interior Nancy Faeser has called for a rigorous investigation after reports that 23 Chinese swimmers failed doping tests ahead of the Tokyo 2021 Olympics, where several of them competed after all were cleared. Faeser, who’s also responsible for sports, told dpa on Sunday that the reports have shaken confidence in the World Anti-Doping Agency (WADA) and the global fight against cheating in elite sport. “Just a few months before the Olympic Games, the suspicion the case was ignored or even covered up must be fully investigated as quickly as possible. If there’s such a seri…