To cope with Trump's erratic behavior, his chief of staff secretly bought a book written by mental health experts who scrutinized Trump's decisions: book

• The former chief of staff consulted a book to deal with the former president.

• There are 27 mental health professionals who examined Trump's behavior.

• An upcoming book says that John Kelly used the book to understand the president.

John Kelly, Trump's former chief of staff, bought a book to learn how to deal with the former president's erratic behavior.

According to a report from The Guardian, Kelly purchased the book to understand the president's particular psychoses.

A book about Donald Trump's behavior was written by 27 psychiatrists and mental health professionals.

According to Glasser and Baker's book, Kelly referred to the White House as "Crazytown" while he was there.

"We know a lot more about Trump in this area than our patients do," said Bandy Lee, a Yale psychiatrist. The personal health of a public figure is her private matter until it becomes a threat to public health.

The Dangerous Case of Donald Trump was written by Glasser and Baker and will be released later this month.

The book says that Kelly told others that the book was a good guide to a president who was a pathological liar.

According to their book, senior officials in the White House agreed with them.

One senior official thought there was something wrong with Trump. He doesn't listen to anyone and he doesn't feel like he should. He doesn't pay much attention to what other people say. I've never seen something like that before.

Business Insider has an article on it.