The documents detail UK ambassador Sir Kim Darroch’s assessments of the Trump administration from 2017 to the present. Mr Darroch, one of Britain’s top diplomats, used secret cables and briefing notes to impugn the President’s character, according to the Mail on Sunday. He warned London that the White House was “uniquely dysfunctional” and that Trump’s career could end in “disgrace”.
The comments could prove to be highly embarrassing for the UK’s Foreign Office.
However, officials insisted the relationship between No. 10 and the White House could withstand the “mischievous behaviour” of the leak and defended Mr Darroch’s nature.
The diplomatic memos obtained by the Mail on Sunday suggest that to communicate with Trump “you need to make your points simple, even blunt”.
Mr Darroch said in the memos: “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.”
He then went on to question whether the White House would ever “look competent”.
The leak comes just weeks after Trump and his family visited the UK and had a State banquet at Buckingham Palace with the Queen.
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In a memo after the visit Mr Darroch said that Trump and his team had been “dazzled” by the visit and that the UK might be “flavour of the month”.
However, his administration said they would remain self-interested and said “this is still the land of America first”.
In another recent document Mr Darroch refers to the “incoherent, chaotic” US policy on Iran and questions Trump’s reason for calling off a retaliatory air strike against Tehran following the downing of an American drone.
Trump publicly said he called off the airstrike because of a potentially high number of casualties.
But Mr Darroch said the explanation does not “stand up” and suggested it may have been motivated by the upcoming 2020 election and Trump’s previous promise to not involve the US in foreign conflicts.
Mr Darroch said: “It’s more likely that he was never fully on board and that he was worried about how this apparent reversal of his 2016 campaign promises would look come 2020.”
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.
“Their views are not necessarily the views of ministers or indeed the Government.
“But we pay them to be candid. Just as the US ambassador here will send back his reading of Westminster politics and personalities.
“Of course we would expect such advice to be handled by ministers and civil servants in the right way, and it’s important that our ambassadors can offer their advice and for it remain confidential.
“Our team in Washington have strong relations with the White House and no doubt… these will withstand such mischievous behaviour.”