Donald Trump is addressing the wide-spread speculation over his mental fitness. The right-wing candidate, 78, took the stage in Milwaukee, Wis., where he mocked the people questioning if he is in the right frame of mind to take on the Presidency again if he wins the Tuesday, November 5, election. “They’re saying, ‘He’s cognitively impaired and physically impaired,'” he told the crowd at his rally. “There’s something wrong with them all because I’ve got guys who are stupid back there. Alright, what are you gunna do? What are you gunna do? What a shame!” The nonsensical rant was roasted on socia…