Donald Trump hurled his worst slur yet at Vice President Kamala Harris while speaking to his supporters in a small Wisconsin town on Saturday. The former president insulted Harris as he ranted about illegal border crossings, describing her as 'mentally impaired.' 'Kamala is mentally impaired. If a Republican did what she did that Republican would be impeached and removed from office and rightfully so for high crimes and misdemeanors,' Trump began. Trump claimed the Democratic nominee was responsible for migrants who have come into the country illegally and have committed crimes. 'Think of it - 13,099 convicted murderers. They're all...