Conor McGregor has come out today, multiple times, accusing Nathan Diaz of steroid use.

In a post on Twitter, McGregor asked, “how come the public isn’t told about positive tests anymore? How after the Nate Diaz steroid debacle, where he produced his own nutrition companies tainted multivitamin, was instantly cleared prior to a mega money fight, are we now in the dark on test results?”

McGregor went on to mock Diaz referring to him as, “Steroid user Nathan Diaz.”

McGregor and Diaz have fought twice at 170 pounds, once at UFC 196 and once at UFC 202. They split those matchups with one apiece.

Both Diaz and McGregor are lined up for fights this summer but this will no doubt add fuel to the fire for a potential trilogy fight before the end of the year.