The President of the United States is often referred to as the most powerful man in the world. But Donald Trump's niece, Mary Trump says the current POTUS is really the most dangerous man in the world. She is so troubled by Trump's abuse of his position that she says it's her patriotic duty to take him down. And to do that she has written a brutal tell-all memoir. As Liam Bartlett discovers in an Australian television exclusive interview, the book is the ultimate insider's account of a truly dysfunctional family. But it has added substance because Doctor Mary Trump is also a clinical psychologist. Her analysis of how her Uncle Don became Uncle Sam is not just a page-turner, it's a horror story.