The art of the (bad) deal: may not be the master negotiator he claims he ...

Despite his frequent boasts, experts are claiming that Donald may not be the master negotiator he thinks he is.

Negotiation expert Marty Latz, author of The Real Deal: An Eye-Opening Look at How He Really Negotiates, said the world's most skilled negotiators are able to bank on their level of 'ethicality—how ethical you are' something 'not necessarily in the DNA of Donald .'

'Is he truly a masterful negotiator?' Latz asked in his book, obtained by Politico. 'I would say not—in business, and certainly not to date as president.' 

Despite his frequent boasts, experts are claiming that Donald Trump may not be the master negotiator he thinks he is

Despite his frequent boasts, experts are claiming that Donald may not be the master negotiator he thinks he is

Some of President 's major campaign promises; to build a wall with Mexico - and make them pay for it, to repeal Obamacare, and appoint a special prosecutor to investigate , have all been stalled or broken entirely. 

Hardly signs of someone who calls himself a 'great negotiator' who lists deal making as his greatest strength.

That wasn't always the case. 

In his younger days, made something of name for himself with the transformation of New York's Commodore Hotel to the refined Grand Hyatt at Grand Central Station - which involved tough negotiations with agents of the bankrupt Penn Central railroad, lenders and officials - and resulted in one of the most generous tax abatements in New York City history when it opened in 1980.

Tony Schwartz's The Art of the Deal deal came out in 1985 heralding Trump as a great negotiator

Tony Schwartz's The Art of the Deal deal came out in 1985 heralding as a great negotiator

'He was clever,' biographer Gwenda Blair said, 'pushing all the pieces around the board.'

He landed another deal with Tower, acquiring land from a faltering department store, leveraging air rights, and sitting down with the subcontractors.

Barbara Res, the Tower construction manager, said she would warn the subcontractors to go in with a higher estimate so could 'beat you down.'

' had to get his pound of flesh. And he had to believe that only he could do that,' she said, adding that sometimes he did land even a better deal than they expected, offering them a chance to be part of the future of the company if they'd take a cheaper deal.

It was also around the time when Tony Schwartz's The Art of the Deal deal came out heralding as a great negotiator.

But, tellingly, the deal that struck with his writer for The Art of the Deal was less than impressive. 

In fact, Schwartz landed one of the best gigs in ghost writing - with an unheard of half a million dollar advance plus half the royalties. The writer even got his name on the front cover in equal sizing as 's 

'He basically just agreed,' Schwartz told Politico.

And evidence points to the fact that became increasingly reckless towards the end of the era as he sought to bolster his brand with iconic and luxury buildings. 

In 1988, he bought Manhattan's Plaza Hotel for $407.5 million - almost $60 million more than the highest market estimate - reportedly saying in the negotiations: 'How can I live without it?' 

He later spun the purchase, when speaking to the press, admitting he'd overpaid but saying the building was the 'Mona Lisa' of real estate.

Trump's guarantees that he would make Mexico pay for the border wall failed when the Mexican president Peña Nieto (pictured with him) flatly refused

's guarantees that he would make Mexico pay for the border wall failed when the Mexican president Peña Nieto (pictured with

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