Donald Trump has a penchant for junk food and Elton John songs played at deafening volumes all while having his trousers steam pressed when he is still wearing them, claims a colourful new inside account of his 2016 election campaign.

According to the book co-written by two former senior aides, the US president’s temper is so brutal that a verbal assault by the leader of the free world is described as having your "face ripped off."

His wrath is so all-consuming that it would "break most hardened men and women into little pieces”, writes Corey Lewandowski, a former campaign manager, and David Bossie, another top aide, in ‘Let Trump Be Trump’.

The two men said there were moments during Mr Trump’s improbable run to the White House when "they wanted to parachute off Trump Force One".

"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," they wrote in the book due for release on Tuesday.