Corey Lewandowski and David Bossie offer a look into a Trump campaign that was defined by fits of rage, fast food, and competing forces of unconditional loyalty in their upcoming book.

In the new tell-all, titled "Let Trump Be Trump,” obtained in advance by the Washington Post, the former campaign manager and senior aide explain the “expletive-filled tirades” the then-candidate would often unleash on his staff when things didn’t go as planned.

The authors explained, “sooner or later, everybody who works for Donald Trump will see a side of him that makes you wonder why you took a job with him in the first place.”

“His wrath is never intended as any personal offense, but sometimes it can be hard not to take it that way,” they wrote. “The mode that he switches into when things aren’t going his way can feel like an all-out assault; it’d break most hardened men and women into little pieces.”

Besides his rage, his diet wasn’t the healthiest either. The men describe how Trump’s four main food groups on the campaign trail consisted of McDonald’s, Kentucky Fried Chicken, pizza, and Diet Coke.

The book states president would order from McDonalds “two Big Macs, two Fillet-O-Fish, and a chocolate malted.”

The book also provides an in-depth look at the relationships between Trump and senior staff members, such as then-press secretary Hope Hicks, who is now White House communications director.

One unusual duty of Hicks’ was to press Trump’s suits while they flew on his plane between campaign stops, typically while he was still wearing the suits.

Trump would yell out for Hicks, “get the machine!” Hicks knew she had to grab the steamer.

“And Hope would take out the steamer and start steaming Mr. Trump’s suit, while he was wearing it! She’d steam the jacket first and then sit in a chair in front of him and steam his pants,” they explained.

The book, which is set to hit store shelves on Den. 5th, also takes a look at pivotal moments of the campaign, such as responding to the "Access Hollywood" tape and Lewandowski’s firing.