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Raisman, one of several US Olympians abused by Nassar said that team-mates had discussed their abuse openly in front of Geddert in 2011, who did not appear to respond.
More than 150 women and girls accused Nassar of a pattern of serial abuse dating back two decades.
Nassar, who had also been employed for decades by Michigan State University, has already been sentenced to 60 years in prison after pleading guilty to child pornography charges.
Raisman hit out in particular at Blackmun's comment that "USA Gymnastics needs to focus on supporting the brave survivors", as too little, too late.
The gymnast demanded an independent probe after several teammates including her spoke out against Nassar who has pleaded guilty to 10 counts of criminal sexual conduct.
More than 100 victims have accused Nassar of sexual assault under the guise of medical treatment, including members of the Olympic gold-medal winning gymnastics team.
Raisman, who won six medals at two Olympic games, including three gold medals, said she was first treated by Nassar at the age of 15.