DONALD Trump’s son has accused Patrick Harvie of being “an irrelevant and spineless politician”.

The outburst from Eric Trump came after the Green MSP called for a "McMafia" order to probe the money behind the president's purchase of land in Scotland.

In First Minister's Questions, Harvie said there were still "big questions" over Trump's business dealings.

He said: "The purchase of the Menie Estate and the Turnberry golf resort were part of Trump’s huge cash spending spree in the midst of a global financial crisis, while his son was bragging about 'money pouring in from Russia'.

"The US House Of Representatives has heard testimony that states: 'We saw patterns of buying and selling that we thought were suggestive of money laundering.'

"The testimony went on to express particular concern about 'the golf courses in Scotland and Ireland.'"

He said the Government had powers to investigate why Trump's "known sources of income do not explain where the money came from for those huge cash transactions".

The Green called on Scottish ministers to apply via the Court of Session for an unexplained wealth order, a so-called McMafia order.

This would kick-start an investigation into his finances, and determine whether he is liable to bribery or corruption.

“There are reasonable grounds for suspecting that his lawfully-obtained income was insufficient," Harvie told MSPs.

“Trump is a politically exposed person in terms of the law, and there are reasonable grounds for suspecting that he – or people he’s connected with – have been involved in serious crime. Some of them pleaded guilty.

“Scottish ministers can apply via the Court of Session for an Unexplained Wealth Order, a tool designed for precisely these kinds of situations.”

Eric Trump said the comments were “disgusting”, made without any supporting evidence, and “reckless, irresponsible and unbecoming for a member of the Scottish Parliament”.

READ MORE: Patrick Harvie: Blasphemy law has no place in modern Scotland

In a statement, he said: “An irrelevant and spineless politician, Mr Harvie has long expressed deep-seated animus toward the Trump Organization, its principals and its projects, making wildly inappropriate allegations to advance his own political agenda and gain attention.

“Over the past decade, the Trump Organization has invested hundreds of millions of dollars in Scotland while creating thousands of jobs.

“Mr Harvie is a disgrace to the Scottish Parliament. His conduct does not serve the best interests of the Scottish people and he should be admonished and sanctioned for his conduct. We demand that he immediately retract his libellous statements failing which we will hold him fully accountable.”

It's not the first time Harvie has been criticised by the Trumps.

Before he was the leader of the free world, and was merely a globetrotting builder of skyscrapers, Donald Trump tried to have the Green politician censured for blasphemy.

The tycoon was trying to stop huge turbines being built near his Aberdeenshire golf resort.

Incredibly, he was invited to appear in front of a committee at the Scottish Parliament, to discuss why wind power was bad.

Asked for proof, he claimed he was "the evidence".

Harvie then posted a tongue-in-cheek image on Twitter using a still from the Monty Python film The Life of Brian.

This prompted a complaint to the standards commissioner by Trump and his right-hand man George Sorial, who described the humorous tweet as “offensive” and “blasphemous”.

The Public Standards Commissioner for Scotland said the submission was "irrelevant and inadmissible".