Sensitive diplomatic cables and memos leaked to the British tabloid the Daily Mail reveal that the UK's ambassador to the US considers President Donald Trump to be "inept", "insecure" and "incompetent".
The critical comments were made by Sir Kim Darroch to various members and officials of the UK government, dating from 2017 to 2019.
"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," said Darroch.
He also warned his government that Trump's career "could end in disgrace".
Mr. Trump lashed out at Mr. Darroch last Sunday in comments to reporters. "The ambassador has not served the U.K. well, I can tell you that," he said. "We are not big fans of that man, and he has not served the U.K. well. So I can understand it and I can say things about him but I won't bother."
A statement by the British Foreign Office made it clear that the documents were authentic and an investigation was launched into how they were leaked.