Nassar's sentencing hearing, which began last week in MI, brought more attention to the accusations against USA Gymnastics.
Former Team USA doctor Larry Nassar was jailed last year for 60 years for possessing child sex abuse images on his computer.
Nassar faces up to 125 years in prison after pleading guilty to seven counts of first-degree criminal sexual conduct.
"We support their decisions to resign", said Perry. "We believe this step will allow us to more effectively move forward in implementing change within our organization", USA Gymnastics President Kerry Perry said, according to another tweet.
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"There has never been a time in my life when I did not know Larry Nassar", Miller said before declaring her hatred for the sports doctor who once went so far as to "treat" her in a supply closet. Nassar allegedly abused the girls, some as young as eight years old, under the guise of medical treatment.
Many gymnasts, including Olympic champions Aly Raisman and McKayla Maroney, say that USA Gymnastics asked them to keep quiet about the abuse they suffered; USA Gymnastics even paid Maroney $1.25 million and had her sign a nondisclosure agreement to keep her allegations a secret.
She said she's been following the case closely and couldn't help but cry when she listened to Raisman's statement.
The announcement comes during the sixth day of Larry Nassar's sentencing trial.
"All these fearless women have power and we will use our voices to make sure you get what you deserve, a life of suffering spent replaying these words delivered by a powerful army of survivors", she said.
Last week, Ms Raisman addressed Nassar in the court, saying: "I love this sport, and that love is stronger than the evil that resides in you, in those who enabled you to hurt many people".