Trump uses the exact same arm motions he used to impersonate a flustered banker, a general, Ted Cruz, himself, and a certain New York Times reporter to impersonate a flustered Donna Brazile:

See the full story proving Trump did not mock a reporter’s disability: https://www.catholics4trump.com/the-true-story-donald-trump-did-not-mock-a-reporters-disability/

See just the videos: https://www.catholics4trump.com/even-more-video-evidence-trump-did-not-mock-reporters-disability/