Elite US gymnast Simone Biles has testified before the Senate about abuse she suffered at the hands of disgraced former team doctor, Larry Nassar.
Former teammates Aly Raisman and McKayla Maroney also appeared before the committee, along with FBI Director Christopher Wray.
The committee is examining shortcomings in the FBI's investigation into Nassar, later convicted of sexually abusing girls.
He is serving a life sentence in jail.
"I blame Larry Nasser, and I also blame an entire system that enabled and perpetrated [sic] his abuse," said Ms Biles, the most decorated Olympic gymnast of all-time.
"If you allow a predator to harm children, the consequences will be swift and severe," she added.
Gymnast Maggie Nichols - the first victim to report her abuse to USA Gymnastics - also testified.
What did the women say?
In emotional testimony on Wednesday, the four women told the Senate Judiciary Committee they had "suffered and continue to suffer" from the abuse they experienced and its bungled handling.
Four-time Olympic gold medallist Simone Biles - one of the most famous figures in world sports - called for the agents involved to be federally prosecuted.
"How much is a little girl worth?" she asked.
Aly Raisman, who served as captain of the 2012 and 2016 US Olympic gymnastics teams, expressed disgust that she was "still fighting for the most basic answers and accountability" more than six years after first reporting her abuse.
"Over the past few years it has become painfully clear how a survivor's healing is affected by the handling of their abuse," she testified.
She criticised the FBI investigation as being "like guesswork", warning that not addressing its serious flaws would result in a recurring "nightmare" for many more women.
McKayla Maroney, who won gold at the London 2012 Olympic Games, described the experience of being interviewed by the FBI as replete with "silence and disregard for my trauma".
"They chose to fabricate, to lie about what I said and protect a serial child molester," she told senators.
"What is the point of reporting abuse if our own FBI agents are going to take it upon themselves to bury that report in a drawer?"