Seems like Michael Wolffe is upping the ante - presumably to further stimulate book sales:
http://www.bbc.co.uk/news/world-us-canada-42579990
http://www.bbc.co.uk/news/world-us-canada-42579990
The author of a controversial book on Donald Trump's White House says the US president has "less credibility than perhaps anybody who has ever walked on Earth at this point".
Mr Wolff told NBC's Today show that Mr Trump's staff "all say he is like a child".
He added: "What they mean by that is he has the need for instant gratification. It's all about him... This man does not read, does not listen. He's like a pinball just shooting off the sides."