By Jeremy Herb, Jamie Gangel and Dan Merica, CNN

“He’s an idiot. It’s pointless to try to convince him of anything. He’s gone off the rails. We’re in crazytown,” Kelly is quoted as saying at a staff meeting in his office. “I don’t even know why any of us are here. This is the worst job I’ve ever had.”

(CNN)WARNING: This story contains graphic language.

President Donald Trump‘s closest aides have taken extraordinary measures in the White House to try to stop what they saw as his most dangerous impulses, going so far as to swipe and hide papers from his desk so he wouldn’t sign them, according to a new book from legendary journalist Bob Woodward.

Woodward’s 448-page book, “Fear: Trump in the White House,” provides an unprecedented inside-the-room look through the eyes of the President’s inner circle. From the Oval Office to the Situation Room to the White House residence, Woodward uses confidential background interviews to illustrate how some of the President’s top advisers view him as a danger to national security and have sought to circumvent the commander in chief.

Many of the feuds and daily clashes have been well documented, but the picture painted by Trump’s confidants, senior staff and Cabinet officials reveal that many of them see an even more alarming situation — worse than previously known or understood. Woodward offers a devastating portrait of a dysfunctional Trump White House, detailing how senior aides — both current and former Trump administration officials — grew exasperated with the President and increasingly worried about his erratic behavior, ignorance and penchant for lying.

Chief of staff John Kelly describes Trump as an “idiot” and “unhinged,” Woodward reports. Defense Secretary James Mattis describes Trump as having the understanding of “a fifth or sixth grader.” And Trump’s former personal lawyer John Dowd describes the President as “a fucking liar,” telling Trump he would end up in an “orange jump suit” if he testified to special counsel Robert Mueller.