Britain's former ambassador to the U.S. vouched for the credibility of Christopher Steele, the author of the explosive dossier detailing Donald Trump's alleged ties to Russia.

Sir Kim Darroch, who quit his post after leaked diplomatic cables revealed his outspoken criticism of President Trump's administration and personality, backed the former MI6 spy when asked by a U.S. official.

Mr Steele's so-called 'dodgy dossier' had alleged that Donald Trump colluded with Russia to fix the 2016 election and that he paid prostitutes to urinate on him in a Moscow hotel room.

Britain's former ambassador to the U.S., Sir Kim Darroch, vouched for the credibility of Christopher Steele, the author of the explosive dossier detailing Donald Trump's alleged ties to Russia

And the same leaked diplomatic cables which revealed Sir Kim's damaging comments about President Trump, in which he called his administration 'inept', also showed that Sir Kim backed Mr Steele's dossier, the Sunday Telegraph reported.

Asked if Mr Steel, was 'legit', Sir Kim had replied: 'Absolutely'.

Steele, who runs a private intelligence firm, had supplied the dossier to an outside company used by Hillary Clinton's election committee.

It contained unverified information that Trump was vulnerable to blackmail from Russia and had engaged in 'golden showers' with prostitutes during a 2013 trip to Moscow for the Miss Universe pageant.

Leaked details of the dossier were seized upon by Trump's detractors as evidence that Russia's President Vladamir Putin had interfered in the election.

As well as supplying the dossier to the Clinton campaign Steele also handed it over to American and British intelligence agencies as he was worried about the national security implications.

Mr Steele's so-called 'dodgy dossier' had alleged that Donald Trump colluded with Russia to fix the 2016 election and that he paid prostitutes to urinate on him in a Moscow hotel room

However, Mr Trump has since been cleared by special counsel Robert Mueller whose long-anticipated report had looked into allegations of Russian collusion.

Special Counsel Robert Mueller exonerated Trump of conspiring with the Russians to win the Presidency.

Since being named as the author of the dossier, Steele kept a low profile and was not seen in public until he was tracked down by MailOnline to a Surrey railway station in March

Looking shocked that his cover was blown, he ran towards a car driven by his wife that just two minutes earlier had dropped him off at the station for his commute to his London office.

He stared rigidly ahead as his wife Katherine drove him the short distance back to his home.

After a career with MI6 that included working at the British Embassy in Moscow Steele left in 2009 to set up his own company Orbis Business Inteligence with another former spy.

It was this company that was hired to write the dossier into alleged Trump-Russia activities.

In the latest tranche of leaked cables, Sir Kim wrote in a memo to Downing Street that Donald Trump's decision to abandon the Iran nuclear deal was an act of 'diplomatic vandalism' to spite his predecessor Barack Obama.

Mr Steele was last seen at a Surrey railway station after being tracked down by MailOnline. When approached, he ran towards his wife's car and was then driven away

The leaked cables and briefing notes led to Sir Kim’s resignation last week after President Trump hit back furiously at Sir Kim's comments, branding the ambassador a 'very stupid guy'.

He said on Twitter: 'The wacky Ambassador that the U.K. foisted upon the United States is not someone we are thrilled with, a very stupid guy.

'He should speak to his country, and Prime Minister May, about their failed Brexit negotiation, and not be upset with my criticism of how badly it was handled.

The leaked cables and briefing notes led to Sir Kim’s resignation last week after President Trump hit back furiously at Sir Kim's comments, branding the ambassador a 'very stupid guy'

'I told how to do that deal, but she went her own foolish way-was unable to get it done.

'A disaster!

'I don't know the Ambassador but have been told he is a pompous fool.

'Tell him the USA now has the best economy and military anywhere in the world, by far.'