Islam Makhachev’s comments regarding Jon Jones’ past doping cases, and whether or not that unqualified him from discussions regarding the greatest athletes of the sport, has initiated a debate between the MMA stars on social media.

It all started Monday, when Makhachev told Red Corner MMA that Jones’ winning streak wasn’t “considered valid” because he was “caught doping twice.” One of those instances was against Makhachev’s longtime friend Daniel Cormier, when Jones’ win was overturned to no-contest — and stripped of the 205-pound title — after he tested positive for a turinabol metabolite.

“I’m not denying that Jon Jones is one of the greatest