USADA typically requires an athlete to submit to testing for four months before a UFC competition, but Lesnar was allowed to be tested in a shorter window because of the short time between his announced comeback in June and his return fight in early July.
Having lost to Lesnar at UFC 200, Hunt said he has asked UFC President Dana White for half of Lesnar's record $2.5 million guaranteed purse or to be released from his contract effective immediately.
Lesnar (6-3) retired from mix martial arts in 2015, but returned to UFC for one bout, which WWE agreed to.
"The UFC organization was notified today that the U.S. Anti-Doping Agency (USADA) has informed Brock Lesnar of a potential Anti-Doping Policy violation stemming from an out-of-competition sample collection on June 28, 2016", UFC said in a statement.
The news on Brock Lesnar potentially committing an anti-doping violation and facing a two-year suspension from UFC was a shocker on Friday.
In a statement, the former UFC heavyweight champion claimed that he would "get to the bottom of this", as well as supplying letters of copies fom three previous tests by USADA, which documented how Lesnar had not been pulled up for any of those samples.
"Consistent with all previous potential anti-doping violations, additional information will be provided at the appropriate time as the process moves forward".
Interim light heavyweight champion Jon Jones was also flagged for a doping violation for a test taken on June 16, and because the results of his test were available before UFC 200, he was taken off the card.
"I've been dealing with that my entire life", Lesnar said on a media conference call days before UFC 200.
Even if WWE decides to punish Lesnar for the infraction based on the drug test administered by USADA, he still would be eligible to return by August 21 when he's scheduled to face Randy Orton at SummerSlam in Brooklyn, New York.
Lesnar is a powerful, multitalented athlete who excelled in collegiate wrestling and tried out for the Minnesota Vikings before pursuing dual career in MMA and the WWE. They are not the ones who had to fight with Lesnar or lose (to him).