Dr. Mary L. Trump Ph.D., a practicing clinical psychologist, is calling on her uncle, Donald Trump, to resign as president of the United States. She said her uncle is emotionally and psychologically unfit for the office.

Dr. Trump is the author of the best selling 211-page book about her uncle, which carries the title, "Too Much and Never Enough: How My Family Created the World's Most Dangerous Man." The book began to retail at bookstores and online on July 14 and is already the Number One online bestseller on Amazon.com.

Amazon said Dr. Trump's book "shines a bright light on the dark history of their family in order to explain how her uncle became the man who now threatens the world's health, economic security, and social fabric."

The first hand expose by Trump's only niece is a damning condemnation of President Trump and his unfitness to hold the office of president of the United States. In it, Dr. Trump describes her uncle as having the mind of a three-year-old toddler beset by a range of mental disorders.

Dr. Trump wrote to her uncle Donald today "is much as he was at three years old: incapable of growing, learning, or evolving, unable to regulate his emotions, moderate his responses, or take  in a national interview on ABC News Wednesday, two days after a federal judge lifted a a gag order that forbade her from talking about her book in public.

During this scathing interview, Dr. Trump asserted her uncle "is utterly incapable of leading this country. And it's dangerous to allow him to do so."

She said the conclusions she drew about her uncle's personality and mental state are based on what she's seen of him over "my entire adult life."

She confessed that as she was writing the book, she came to realize there are a lot of parallels between the circumstances in which my family operated and the circumstances the U.S. now faces.

"I saw firsthand what focusing on the wrong things, elevating the wrong people can do, the collateral damage that can be done by allowing someone to live their lives without accountability," she said.

In her book, Dr. Trump writes her uncle's mental problems meet all nine criteria needed to be diagnosed as a narcissist. She emphasized her uncle's mental problems are far more complicated than mere narcissism.

"The fact is, Donald's pathologies are so complex and his behaviors so often inexplicable that coming up with an accurate and comprehensive diagnosis would require a full battery of psychological and neuropsychological tests that he'll never sit for," she writes in her book.

Donald Trump's immaturity and mental health problems are a danger for the United States. Dr. Trump warned a second term for her uncle "would be the end of American democracy."