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The new business will focus on growing media rights and sponsorship revenue, and will be lead by Endeavor CEO Ari Emanuel. Vince McMahon, executive chairman at WWE, will serve in the same role.

This will be Trump's second sporting event in the span of a week. The president's connections to UFC go back to at least 2001.

As some MMA fans suspected, the 27-year-old Dublin native's retirement announcement was simply a maneuver to gain leverage in his contract disagreement with the UFC.

McGregor made the announcement on Twitter, but some MMA fans are questioning whether the brash 27-year-old fighter means what he says or if this is simply a move to get more money from UFC.