Two key players in Donald Trump's campaign have revealed what the President is really like behind closed doors in a revealing new book.

In Let Trump Be Trump, released overnight in the US, Trump's early campaign manager Corey Lewandowski and deputy campaign manager David Bossie provide an insider's account of how the real estate developer pulled off the biggest political upset in history.

The book is at pains to paint the President as a mould-breaking hero, but it unwittingly provides a steady stream of laugh-out-loud moments that often make Trump look like a petulant brat incapable of admitting his own mistakes.

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It's worth noting that the book is nakedly self-serving. Lewandowski and Bossie are out to claim credit for their roles in Trump's election and, strangely, refer to themselves in the third person throughout the book, despite being billed as its sole authors.

With that in mind, here are some highlights.

Let Trump Be Trump authors David Bossie, Former Deputy Campaign Manager for President Donald Trump, and Corey Lewandowski, Former Campaign Manager for President Donald Trump. Photo / Getty Images
Let Trump Be Trump authors David Bossie, Former Deputy Campaign Manager for President Donald Trump, and Corey Lewandowski, Former Campaign Manager for President Donald Trump. Photo / Getty Images

Trump will 'tear the face off' staff when he's cranky

Temper, temper, Mr President.

The book's 278 pages are a parade of colourful anecdotes about Trump tearing shreds off his staff members and chucking tantrums when things don't go his way.

"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," the book says.

"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.

"Around the campaign, we call it getting your face ripped off."

In one episode described in the book, Trump turns his rage towards campaign manager Paul Manafort, who the candidate felt was trying to control him during debate prep.

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"Am I a baby, Paul?" Trump thundered.

"You think you're so f***ing smart! Like you're a genius! Well, you suck on TV."

After the blast, Manafort "looked like a crushed blue beer can".

In another encounter, Trump went "f***ing ballistic" when he read a tweet that claimed Manafort wanted to limit the candidate's appearances on TV.

"Did you say I shouldn't be on TV on Sunday?" Trump screamed to Manafort down the phone while in a helicopter.

President Donald Trump speaks about tax reform. Photo / AP
President Donald Trump speaks about tax reform. Photo / AP

"I'll go on TV anytime I goddamn f***ing want and you won't say another f***ing word about me."

Another episode presents Trump as decidedly ungrateful to Republican Rudy Giuliani after he took a whole round of bullets for the candidate.

When the infamous "grab 'em by the pussy" tape was leaked in the final weeks of the campaign, nearly all of Trump's supporters abandoned him.

However, New York mayor Giuliani put up his hand to appear on all five Sunday morning TV shows to defend Trump.

After being bollocked by the toughest political journalists in the country — picture going five rounds with Leigh Sales — this is how Trump thanked Giuliani: "Man, Rudy, you sucked. You were weak. Low energy."

Trump also tore strips off his media adviser Hope Hicks when she once forgot the steamer used to take wrinkles out of his suit.

"Goddammit, Hope! How the hell could you forget the machine? I want it now!" Trump bellowed.

It was not a mistake she would repeat.

He has the tastes of an 8-year-old

The authors say that Trump's campaign ran on junk food — and one of the greatest challenges was making sure you had it hot and ready whenever Trump happened to grow peckish.

No joke, the book says: "The orchestrating and timing of Mr Trump's meals was as important as any other aspect of his march to the presidency."

Trump hardly ever ate lunch, but dinner was usually Macca's washed down with a chocolate thickshake, which he referred to as a "malted".

Donald Trump's standard dinner: Macca's and a Diet Coke. Photo / Instagram
Donald Trump's standard dinner: Macca's and a Diet Coke. Photo / Instagram

And Trump's order had a hint of the Hamburglar about it.

One night in Chicago, the candidate ordered two Big Macs, two Fillet-O-Fish burgers and a chocolate "malted".

"On Trump Force One, there were four major food groups: McDonald's, Kentucky Fried Chicken, pizza and Diet Coke," the book says.

Trump, whom the authors refer to as "the boss", is also painted as a germaphobe who would only eat his beloved Oreo biscuits if the packet was unopened.

Finger lickin' good! Photo / Twitter
Finger lickin' good! Photo / Twitter

"If you've seen the Seinfeld episode in which George double-dips his chip, you have a pretty good idea of the boss' reasoning," the book says.

Another fun fact from the book: Trump loves Elton John and will blare his music "loud enough to rattle your brain".

Donald, you're a star in the face of the sky.

He is super superstitious

The book describes Trump as "one of the most superstitious men that most people have ever met".

It says he throws salt over his shoulder before meals and pre-emptively celebrating a win is seen in Team Trump as inviting "bad juju".

President Donald Trump yells to reporters as he walks to board Marine One on the South Lawn of the White House. Photo / AP
President Donald Trump yells to reporters as he walks to board Marine One on the South Lawn of the White House. Photo / AP

Trump's presidential victory speech was written on the fly because he considered it bad luck to prepare one ahead of time.

The ego has landed

A big ego is surely a prerequisite for anyone running for president, but the book shows that Trump's high opinion of himself is off the charts.

During a meeting with Lewandowski in the campaign's infancy, Trump began boasting of his riches for no apparent reason.

"I want you to know I have the greatest air force in the world," Trump said, apropos of nothing.

"I've got a 757, I've got a Citation X. And I've got three helicopters.

"I also have a bunch of houses and 17 golf courses."

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Lewandowski explained the "gratuitous boasting" by saying his "thoughts sometime come out like pieces of a puzzle".

"Sometimes the puzzle pieces form a masterpiece," the book suggests.

The book makes clear that Trump "never apologises" — and never feels the need to ask God for forgiveness.

The blame for mistakes is always placed at the feet of his staff.

"I'm doing a great job, but my staff sucks," Trump told Lewandowski after his inauguration.

The campaign's ignorance was a strength

Despite having the backing of a multi-millionaire, the Trump campaign started small; little more than a cubicle wedged into the 24th floor of Trump Tower in New York.

In fact, the authors view the team's political ignorance as a strength — because "they never saw us coming".

"It's remarkable when you think about it," the book says. "Donald Trump launched his presidential campaign with a tweet, an escalator ride and a staff that mostly wouldn't know the difference between a caucus and a cactus.

President Donald Trump meets with health insurance company CEOs. Photo / AP
President Donald Trump meets with health insurance company CEOs. Photo / AP

"There were no pollsters, media coaches or focus groups. No speechwriter, no 'senior strategist' or any of the other types of 'professional' political consultants like the ones who had failed for the last eight years to elect a Republican president.

"We were the island of misfit toys."

In the early days of the campaign, Trump spoke off-the-cuff almost exclusively, and he greatly resisted being prepped for debates with standard talking points. The voters got Trump uncut, for better or for worse.

His war on political correctness won the election

What the book gets right is its appraisal of Trump's ability to reach and inspire American voters by eschewing political correctness.

The book shows that Trump knew how to speak to crowds from the beginning.

"He mesmerised the crowd, which numbered a thousand or more," the book says of an early rally.

"They gave him a thundering standing ovation."

It also sings the praises of his politically savvy "America first" policies, which resonated with heartland voters.

"Do you want to know why no politician had a chance against Donald Trump in the primaries? He told it like it was."

By the time his debates with Hillary Clinton rolled around, he had honed his messages.

"His assault on political correctness resonated with people across the country," the book says.

"Whether it was Rosie O'Donnell's weight, or a federal judge, or any of the reporters following the campaign, no one was off-limits.

President Donald Trump takes a question from a reporter before boarding Marine One on the South Lawn of the White House in Washington. Photo / AP
President Donald Trump takes a question from a reporter before boarding Marine One on the South Lawn of the White House in Washington. Photo / AP

"And only Donald Trump could get away with what he got away with."

The authors say his opponents and the media were "tone deaf" to the voters' views on immigration and radical Islamic terrorism.

"They were tired of the PC doubletalk from coastal elites and even more tired of those condescending attitudes," the book says. "The boss took a flamethrower to all of it."

The authors appear completely comfortable with some of the President's most jarring comments during the campaign, such as when he referred to Mexicans sending their "rapists" across the border, and when he said senator John McCain was "not a war hero" because "he was captured".

Frankly, it didn't matter whether Trump was spouting falsehoods.

"It didn't matter to the people who listened to Trump whether the boss had gotten the details correct," the book says.

"His words captured the way they felt, and that's all that mattered to them."

No one — Trump included — thought he would win

Trump likes to point out that the "fake news" media was dead wrong when they wrote him off as a presidential candidate.

But the book makes clear that from the announcement of his candidacy right up until election night, even Trump doubted he would win.

Steve Bannon, who went on to serve as the campaign's chief executive, laughed at the prospect of President Trump in 2012.

"He's got a zero chance. Less than zero," Bannon told Bossie.

Countless times in the book even the most senior members of Mr Trump's staff wrote off his campaign.

For Lewandowski, it came when Trump criticised McCain's war record.

Teflon Trump ... The Access Hollywood tape wasn't enough to sink his campaign.
Teflon Trump ... The Access Hollywood tape wasn't enough to sink his campaign.

The Access Hollywood tape and the string of women who accused him of sexual misconduct made Trump ponder defeat in the campaign's final month.

"Well, I can always go back to my old life, take a long vacation," he said.

As we all know, election night had a happy ending for the mercurial reality TV star.

He was as shocked with the result as anyone.

"Dave can you believe this?" he told Bossie after the result.

"We just started this to have some fun."

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