Olympic gold medalist Simone Biles told Congress in forceful testimony Wednesday that federal law enforcement and gymnastics officials turned a “blind eye” to USA Gymnastics team doctor Larry Nassar’s sexual abuse of her and hundreds of other women.

Nassar was charged in 2016 with federal child pornography offenses and sexual abuse charges in Michigan. He is now serving decades in prison after hundreds of girls and women said he sexually abused them under the guise of medical treatment when he worked for Michigan State and Indiana-based USA Gymnastics, which trains Olympians.

Biles told the Senate Judiciary Committee that “enough is enough” as she and three other U.S. gymnasts spoke in stark emotional terms about the lasting toll Nassar’s crimes have taken on their lives. In response, FBI Director Christopher Wray said he was “deeply and profoundly sorry” for delays in Nassar’s prosecution and the pain it caused.

The four-time Olympic gold medalist and five-time world champion — widely considered to be the greatest gymnast of all time — said she “can imagine no place that I would be less comfortable right now than sitting here in front of you.” She declared herself a survivor of sexual abuse.

“I blame Larry Nassar and I also blame an entire system that enabled and perpetrated his abuse,” Biles said through tears. In addition to failures of the FBI, she said USA Gymnastics and the United States Olympic and Paralympic Committee “knew that I was abused by their official team doctor long before I was ever made aware of their knowledge.”

Biles said a message needs to be sent: “If you allow a predator to harm children, the consequences will be swift and severe. Enough is enough.”

The hearing is part of a congressional effort to hold the FBI accountable after multiple missteps in investigating the case, including the delays that allowed the now-imprisoned Nassar to abuse other young gymnasts. All four witnesses said they knew girls or women who were molested by Nassar after the FBI had been made aware of allegations against him in 2015.

An internal investigation by the Justice Department released in July said the FBI made fundamental errors in the probe and did not treat the case with the “utmost seriousness” after USA Gymnastics first reported the allegations to the FBI’s field office in Indianapolis in 2015. The FBI has acknowledged its own conduct was inexcusable.