Former two-division UFC champion  Jon Jones recently relinquished his heavyweight championship and announced  his retirement . Two weeks later, after President  Donald Trump announced that a UFC event on the White House grounds was being planned for next year,  Jones re-entered the anti-doping testing pool to “keep everyone’s options open.” When Jones posted on social media that he had re-entered the testing pool, rival and fellow two-division UFC titleholder  Daniel Cormier thought Jones was trolling.  “I figured he was trolling. I thought he was trolling