She gives a scathing critique of her uncle Donald.
It's not the only claim in his speech that has people doubting his honesty.
"Make no mistake, this left-wing cultural revolution is designed to overthrow the American revolution."
He's expected to rail against a "left wing mob".
Accounts of the US President's phone calls have been outlined by senior US officials.
The post has since been deleted from Trump's Twitter page.
"The president is a disgrace to the values we cherish in New York City".
Publishers say the book will be "a nightmare of traumas, destructive relationships, and a tragic combination of neglect and abuse".
The book, scheduled to hit store shelves on Tuesday, is already in the hands of media organisations.