Donald Trump on Saturday attended the 153rd Annual National Rifle Association Meeting in Dallas, Texas, where he gave the keynote speech and claimed his former doctor once said he was a “better physical specimen” than Barack Obama. Trump mentioned a lot of his greatest hits at the speech, but things went off-script when he dealt with a “brutal” flying insect. Before that moment, however, the 45th president spoke about his time in office, when he had the same White House doctor as Obama did. “They asked him who is a better physical specimen, is it Donald Trump, or is it Obama?” Trump said on Sa…