Conor McGregor has a new cornerman in one of his business pursuits ... it's none other than Donald Trump Jr.!!
Mixed Martial Arts Group (MMA.Inc) -- a company backed by the UFC superstar -- announced POTUS' son as its newest strategic advisor on Tuesday ... a move that has Notorious stoked.
"Don is a globally recognized business leader with a deep passion for martial arts and for the coaches and small business owners who are the backbone of this sport," McGregor -- the company's key investor -- said.