I don't think Trump sounds like Dubya at all. He sounds like a very confused Mafioso with acute Attention Deficit Disorder.

I heard on BBC Radio 4 an American novelist who was being interviewed because she had written a book that painted the exact scenario that we have just witnessed made real, the US election fiasco. She was asked why she hasn't yet parodied Trump and explained it would make her dialogue completely incomprehensible.

and in the New Scientist a more analytical appraisal:

Trump, a man who speaks in so many nested clauses that reading transcripts feels like unpacking a bewildering series of Matryoshka dolls.
A president who doesn't waste time finishing one sentence that could be better spent starting another.
Might we expect a US veto on full stops, to be replaced forever with semi-colons?

They fear it will start a fashion!