Donald Trump took some heat from the Joe Biden campaign on Saturday after the former president gave a speech for the National Rifle Association in Texas, and appeared to mess up his words as well as some key facts. Trump, who was mocked online for bragging during the speech that he was healthier and a “better physical specimen” than fellow former president Barack Obama, also dealt with a bothersome fly during the political campaign event. He called the fly “brutal” as he swatted it away while speaking. After the event, the reception was less than stellar from the rapid-response team for the Bi…