LAS VEGAS -- Interim UFC light heavyweight champion Jon Jones has been pulled from his title unification bout against Daniel Cormier at UFC 200 on Saturday, after the U.S. Anti-Doping Agency informed Jones of a potential doping violation on Wednesday.
UFC president Dana White announced the move during an impromptu news conference at MGM Grand Hotel.
Jones tested positive for a banned substance in an out-of-competition sample taken June 16 by USADA, said Jeff Novitzky, UFC's vice president of athlete health and performance. USADA administers the UFC's anti-drug policy.
A heavyweight fight between Brock Lesnar and Mark Hunt will now headline UFC 200, which takes place on Saturday at T-Mobile Arena.