There are different forms of Parkinsons.

That said, if you watch Trump walk his gait is not even, a sign of vascular dementia.

I'm dealing with both Parkinson's and vascular dementia in my world right now.
The signs are alarming when watching Trump in action.

His failure to read or comprehend complex documents, mispronunciation of words, his gait, it all points to some form of brain degeneration.

If it can't be blamed on a disease that makes him even scarier.