The ban has been put in place following "allegations of misconduct", as reported by SwimSwam.

The nature of the claims is not yet known after Levingston was named on the suspension list on July 7.

Born with autism, Levingston has been tipped to compete at the Paralympics.

Levingston had been charged with three counts of aggravated indecent liberties with a child and two counts of lewd and lascivious behaviour in 2018.

Those charges were dropped two years ago but Levingston said at the time of that decision that the case had dashed his hopes of representing the United States at Tokyo 2020.

"On August 23rd 2018, I had my whole life upended when I was arrested and charged with child sex abuse after being falsely accused by two people and being forced into giving false statements to police," Levingston wrote on Instagram.

"I was held in jail for 86 days on a 500 thousand dollar bond before the judge finally lowered it and let me out and then after that, I was put on house arrest and held in my own house for 103 days.

"I faced life in prison, I couldn’t leave the state, I lost my job, I lost friends, I lost my swim career and my dream to compete in the Tokyo 2020 Olympic games were tarnished."