TMZ Sports spoke to White this morning ... who tells us, "It's not true. We haven't talked to Conor or his manager since the press conference. I don't know why he would tweet that."
He adds, "All the media keeps asking me that. I feel like the scene in 'Step Brothers' when they ask if they can build the bunk beds. I don't know how many more times I can say the fight is off or how many more press conferences I can have saying the fight is off for people to believe it's off."
TRANSLATION -- THE FIGHT IS OFF!!!!
McGregor caused a firestorm Monday morning by tweeting, "Happy to announce that I am BACK on UFC 200! Shout out to @danawhite and @lorenzofertitta on getting this one done for the fans. #Respect"