Three-time Olympic gymnast Aly Raisman alleges in an upcoming 60 Minutes interview set to air Sunday that she was sexually abused by USA team doctor Larry Nassar, who has been accused of sexual abuse by more than 100 other individuals. She also details the allegations in her new booked titled “Fierce.”

Raisman, 23, told CBS she was first treated by Nassar when she was 15. The gymnast, who talked to the FBI about Nassar after serving as national team captain at the 2016 Games in Rio de Janeiro, is calling for changes at USA Gymnastics.

“I am angry,” said Raisman. “I'm really upset because it's been... I care a lot, you know, when I see these young girls that come up to me, and they ask for pictures or autographs, whatever it is, I just... I can't. Every time I look at them, every time I see them smiling, I just think... I just want to create change so that they never, ever have to go through this.”

Raisman is one of the most well-known gymnastic stars. She was part of the “Fierce Five” team, which included Maroney Jordyn Wieber, Gabby Douglas and Kyla Ross. The team rose to stardom after their successful routines at the 2012 London Olympics. Raisman has won a total of six medals, three of them gold, during her time at the London Olympics and the Rio Olympics last year.

Raisman’s accusations come less than a month after fellow gymnast McKayla Maroney also accused Nassar of sexually abusing her. Nassar, an osteopath, worked for the women’s gymnastics national team for nearly 30 years.

Maroney revealed her story about Nassar on Twitter under the #MeToo campaign, which launched after the Harvey Weinstein scandal broke.

“People should know that this is not just happening in Hollywood. This is happening everywhere,” Maroney said last month. “Wherever there is a position of power, there seems to be potential for abuse. I had a dream to go to the Olympics, and the things that I had to endure to get there, were unnecessary, and disgusting.”

Raisman said many people have asked why Nassar’s alleged victims didn’t speak up before, adding it’s something that shouldn’t be the focus of the problem.

“Why are we looking at why didn't the girls speak up? Why not look at what about the culture? What did USA Gymnastics do, and Larry Nassar do, to manipulate these girls so much that they are so afraid to speak up?” she told 60 Minutes.

USA Gymnastics said in a statement to CBS that it has made major changes since Nassar’s actions came to the spotlight. The sport’s governing body said it recently implemented a new "safe sport policy" that requires mandatory reporting of suspicions of sexual abuse and works to "prevent inappropriate interaction" between athletes and adults.

Nassar is currently in jail after pleading guilty to child pornography charges. More than 130 women have filed lawsuits claiming sexual abuse by Nassar during his time with the USA gymnastics team. The alleged victims said he abused them under the guise of getting medical “treatment” for hip, back and other injuries.

Nassar pleaded not guilty to the sexual assault charges. He faces 22 counts of first-degree criminal sexual conduct and could be sentenced to life in prison.