The future king and wife Kate, Duchess of Cambridge, met with Mr Brown – a pro-Unionist politician – during a visit to Scotland last week. But the increasingly madcap politician failed to mention that the Duke and Duchess of Cambridge also met with SNP leader Nicola Sturgeon during the same tour.
Mr Salmond – who created the fringe Alba Party after falling spectacularly out with the SNP – even accused pro-UK leaders of “unscrupulous unionist desperation” by trying to recruit the royals to campaign for staying in the United Kingdom.
In a bizarre rant, he said: “Whatever Prince William thought he was doing by agreeing to a confab with Gordon Brown just as he set up his latest campaign for the union …
“We should have no hesitation in seeing from that meeting, unionist preparation for attempting to persuade a constitutional monarchy to intervene in a constitutional debate which should be left to the people.”
He added: “It would be very wise for the royal family to follow what has been the Queen’s example over her long reign, to keep the monarchy over and above politics.
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He made no mention of politics and adopted a decades-old approach maintained by royalty of staying strictly neutral in all matters political.
But his blatant attempts at neutrality, and his meeting with the current Scottish First Minister – who is vocally demanding a second Scottish independence referendum – did nothing to appease Mr Salmond.
He ranted: “Back in 2014, David Cameron made a last-ditch desperate and failed attempt to drag the Queen into politics.
“The Brown meeting shows poor judgment on both sides, but the same degree of unscrupulous unionist desperation.
“The independence team should take note.”
Despite launching Alba to much fanfare ahead of Holyrood’s May election it failed to strike a chord with the Scottish electorate.
It won no MSPs in the poll and its only two sitting MPs defected from the SNP.
Ms Sturgeon’s SNP – once led by Mr Salmond – meanwhile maintained its lead as the largest party in Holyrood although it came short of an overall majority in the Scottish Parliament.