United States Senator John McCain was once one of MMA’s most vehement opponents – his “human cockfighting” line has lived in infamy – but the former US Naval Academy boxer has warmed up to the sport over the past few years. The Republican senator was recently interviewed on AXS.tv after his role in the start of the Cleveland Clinic brain study where he discussed his changing opinion on the sport and whether or not he would have competed in the sport had it been around in his day.