• U.S. Presidential candidate Donald Trump is speaking at the Republican National Convention.

U.S. Presidential candidate Donald Trump is speaking at the Republican National Convention. (Photo : Getty mages/John Moore)

"Trump: The Art Of The Deal" co-author Tony Schwartz has come out to say that Donald Trump isn't smart at all as people think, and that he wouldn't have written the book in 1987 had he known that Trump will be running as the president of the United States.

Schwartz went out to say everything negative about the presidential candidate and business magnate when he was writing the book in an interview with Good Morning America posted by The Huffington Post. He claimed to have written everything in the book and that he regrets his involvement with him.

Like Us on Facebook

Schwartz went as far as to call Trump a man who had no attention span, a sociopath, and the worst and most dangerous candidate to run for the presidency for his whole adult life. "He is very insecure and not nearly as smart as people imagine him to be," he was quoted as saying.

With someone like Putin, who is much smarter than Trump, provoking him cleverly, he is worried for the future and even claimed that Trump would end civilization. Schwartz claims to haven't slept a night through ever since the business magnate announced his presidential candidacy last year.

Before "Trump: The Art Of The Deal" was published, Schwartz spent 18 months with the presidential candidate and called the process as being draining and deadening. His claim of being the sole author of the book was backed up by Howard Kaminsky, who was the former head of Random House, the publication that published Trump's book.

Being #1 in the New York Times best selling books for 51 weeks in 1987, Schwartz said that he had put a lipstick on a pig, referring to Trump. Furthermore, he also said that he would call the book "The Sociopath" had he written the book today, he was quoted as saying in an interview with The New Yorker.

Trump has been one of the most controversial candidates to run for the president position of the U.S. He has received widespread criticism for his harsh plans for Mexicans and Muslims, barring them from entering the country if he wins the position.