Raisman, 23, says she was first treated by Dr. Nassar when she was 15. She talks about her experiences in a new book called “Fierce.” It’s the story of a girl who dreamed of going to the Olympics, and how she realized her goal, but it also includes new insights into a scandal that goes to the highest level of Raisman’s sport.

Dr. Nassar, who worked with the U.S. women’s national gymnastics teams for more than two decades, is now in jail. He pleaded guilty to child pornography charges but not guilty to charges of sexual assault. More than 130 women, many of them former athletes, have filed civil lawsuits alleging that Nassar sexually abused them under the guise of treating them for hip, back, and other athletic injuries. Raisman tells 60 Minutes that after the Rio Olympics she spoke to FBI investigators about Dr. Nassar.