Conor McGregor hopes to cash in on his rematch promise from Floyd Mayweather .  The UFC White House card has weighty expectations on its shoulders, with fans demanding the best card they’ve ever seen. There are several ways to make the event a must-see affair with the amount of talent that the UFC has on its roster, but out of all the fights to be rumored for June 14, a crossover bout may be the most exciting. At the height of his game in the octagon, Conor McGregor was a two-weight world champion, with his fame ascending beyond the cage