On January 18, 2018, Biles revealed on Twitter that former USA Gymnastics physician Larry Nassar had sexually assaulted her and that USA Gymnastics had helped allow the abuse to occur and to cover it up.
On September 15, 2021, Biles testified to the Senate Judiciary Committee that she blamed "the entire system" for enabling and perpetuating Nassar's crimes, saying that USA Gymnastics and the United States Olympic and Paralympic Committee "failed to do their jobs".