The Foreign Office is to investigate how secret memos about Donald Trump and his administration were leaked to a newspaper.
The notes by Britain’s ambassador to the US gave a withering insight into the White House.
Sir Kim Darroch, 65, said the Trump operation was “inept” and “dysfunctional”.
The President responded by attacking Sir Kim, saying he’d “not served the UK well”.
Trump’s team said the ambassador’s position was “no longer tenable” and they expect him to be removed.
Nigel Farage – an ally of Trump – went further, demanding Sir Kim be sacked.
The Brexit Party leader said Sir Kim was “totally unsuitable for the job.”
And, in a tweet, added “the sooner he is gone the better.”
In the leaked memos Sir Kim questioned if the White House will “ever look competent”.
The diplomatic notes say that to make the President understand “you need to make your points simple, even blunt”.
One stated: “We don’t really believe this administration is going to become substantially more normal; less dysfunctional; less unpredictable; less faction riven; less diplomatically clumsy and inept.”
Sir Kim said Mr Trump had been “dazzled” by the pomp and ceremony on his state visit to Britain last month
However, he wrote, despite the display “this is still the land of America First”.
Among the hoard of memos obtained by the Mail on Sunday, Sir Kim claims US policy on Iran is “incoherent, and chaotic”.
And, another said that press reports of in-fighting in the White House soon after Mr Trump’s inauguration were “mostly true”.
As the Foreign Office launched its investigation Tory MP Tom Tugendhat, chairman of the Commons Foreign Affairs Select Committee insisted diplomats should be able to communicate securely.
And, he said that the person responsible for the leak should be prosecuted.
In a tweet he added: “It’s just another betrayal.
“People who do this undermine the interests and security of the British people.
“There a word for that – treason.”
A Foreign Office spokesman said: “The British public would expect our ambassadors to provide ministers with an honest, unvarnished assessment of the politics in their country.
“Our team in Washington have strong relations with the White House. No doubt these will withstand such mischievous behaviour.”
