Simon & Schuster's CEO says some have compared her runaway bestseller to "The Godfather."
The president’s niece also suggested why her uncle was drawn to Vladimir Putin in an interview with MSNBC's Joy Reid.
The president's niece said if she just wanted money she would have written her book 10 years ago, when "I would not have been taking the risk that I’m taking."
"We're talking about a man who I do not believe could function in the real world on his own," the president's niece told Stephen Colbert.
The president called Mary L. Trump "a seldom seen niece who knows little about me," and he insists his parents couldn't stand her.
"I don’t think that should surprise anybody," President Donald Trump's niece told MSNBC.
Donald Trump's niece published a tell-all book this week after his family failed to block its release.
The ruling will allow Mary Trump to publicize her book about the president when it hits stores on Tuesday.
The guest host had fun with Donald Trump's niece's upcoming tell-all book.
Donald Trump's niece alleges in her upcoming book that her uncle cheated his way into college and commented on her breasts.