The former team doctor of the US gymnastics team has been sentenced to 60 years in prison on federal child pornography charges to which he had pleaded guilty.

Separately, Lawrence Nassar, 54, pleaded guilty last month in Michigan state court to sexually abusing seven young athletes during medical exams. He is expected to be sentenced in January to at least 25 years in prison on those charges.

The federal judge on Thursday ordered that Nassar’s federal sentence be served consecutively to his upcoming state prison sentence.

The sentences will assure that he dies in prison.

Three of the victims in the state case were under 13 at the time of the abuse, and others were between 13 and 15, according to the guilty plea.

The Indianapolis Star newspaper first revealed ongoing abuse against gymnasts. More than 100 women and girls, including three-time gold medallist Gabby Douglas and other US Olympic team members, have since come forward to accuse Nassar of abuse.

Fellow Olympian McKayla Maroney told court in an open letter that “Nassar is a monster”.

McKayla Maroney said Nassar left scars on her psyche that may never go away. Photo: Getty

“Nassar is a monster … who left scars on my psyche that may never go away,” she wrote.

“It started when I was 13 years old, at one of my first national team training camps, in Texas, and it didn’t end until I left the sport.”

Nassar was reported to the FBI and fired by US Gymnastics in 2015.

Nassar was also a team doctor for decades at Michigan State University.

He was fired in 2016.

Both the university, the sport federation and the US Olympic Committee have come under fire for not doing more to protect young athletes and are facing lawsuits related to the abuse.