WASHINGTON, United States — Long before the first punch lands at President Donald Trump's unprecedented hosting of a UFC fight on the White House lawn, some in the usually ultra-pro-Trump mixed martial arts community are already throwing political blows. The June 14th event should be ultimate safe territory for the Republican, who will celebrate his 80th birthday that day.Trump has close ties with the violent, popular sport's leaders and many of its leading fighters are open supporters. But jarring tensions are emerging in the run-up to UFC Freedom 250, the event being held in a specially built arena erected over the White...