Three members of the board of directors for USA Gymnastics resigned Monday as criticism increased over the organization's handling of a sex-abuse scandal that involved former team doctor Larry Nassar, NBC News reported.

Board Chairman Paul Parilla, Vice Chairman Jay Binder and Treasurer Bitsy Kelley announced they were resigning, a move that was supported by Kerry Perry, the organization’s president and CEO.

"We support their decisions to resign at this time," Perry said. “We believe this step will allow us to more effectively move forward in implementing change within our organization.

"As the board identifies its next chair and fills the vacant board positions, we remain focused on working every day to ensure that our culture, policies and actions reflect our commitment to those we serve.”

USA Gymnastics, based in Indianapolis, trains Olympians, including nearly 100 competitors who said that Nassar sexually assaulted them, NBC News reported. Monday was the fifth day in which victim impact statements were given in Nassar's sentencing, the New York Post reported.

Nassar, who spent more than 20 years working at Michigan State University and as a physician for USA Gymnastics, has admitted to sexually assaulting gymnasts, ESPN reported. In December, Nassar was sentenced to 60 years in prison on charges of child pornography.

Monday was the fifth day of victim impact statements in Nassar’s sentencing.

USA Gymnastics has been criticized by Olympic gold medalists Aly Raisman, McKayla Maroney, Simone Biles and Jordyn Weiber -- all of whom allege Nassar molested them.