Donald Trump's son has attacked the Scottish Greens' co-leader as an "an irrelevant and spineless politician" after the MSP raised suggestions the family's two golf resorts north of the Border could be linked to money laundering.

Eric Trump accused Patrick Harvie of making "wildly inappropriate claims" over the Trump Organization's courses at Turnberry, Ayrshire and Aberdeenshire.

Mr Harvie told the Scottish Parliament there were "reasonable grounds for suspecting" that the President's "lawfully obtained income is insufficient" to have funded the resorts.

But Mr Trump, the company's executive vice-president, warned Mr Harvie he would be held "fully accountable" over the "libelous" allegation and said he was a "disgrace" to the Scottish Parliament.

His intervention came after the Scottish Greens' co-leader urged Nicola Sturgeon to take legal action to force the US President to disclose how he could afford his Scottish golf resorts.

Mr Harvie said the First Minister should apply to the Court of Session to obtain an unexplained wealth order over the purchase of land for Trump International Golf Links in Aberdeenshire and the Trump Turnberry resort in Ayrshire.

He claimed the Scottish Government needed to act after the US House of Representatives heard about potential money laundering, with "money pouring in from Russia" in the midst of the global financial crisis.