Theresa May has “full faith” in the UK ambassador who criticised the Trump administration in leaked emails but she does not agree with his assessment.

The PM’s spokesman added that the leak was “absolutely unacceptable” and No 10 had made contact with the White House.

Sir Kim Darroch, the UK’s ambassador in Washington, described Donald Trump’s administration as “inept” in emails.

A senior Conservative MP has asked the Metropolitan Police to open a criminal investigation into the leak.

The US president responded to Sir Kim’s comments by saying “we’re not big fans of that man and he has not served the UK well”.

The prime minister’s spokesman said it was “the job of ambassadors to provide honest and unvarnished opinions” but Mrs May “does not agree with the assessment”.

“The leak is absolutely unacceptable and, as you would expect, contact has been made with the Trump administration setting out our view that we believe that it is unacceptable,” he added.

The chairman of the foreign affairs committee, Tom Tugendhat, told the House of Commons on Monday he had written to Met Commissioner Cressida Dick to ask for a criminal investigation.

“I have asked her for reassurance that all necessary resources will be made available to ensure that the source of this leak is determined as a priority,” he said.

Foreign Office minister Sir Alan Duncan responded by saying a cross-government investigation would be “comprehensive” and the police “could be involved” if there was evidence of criminality.

Trade secretary Liam Fox told the BBC the leak was “unprofessional, unethical and unpatriotic”, adding that whoever released the emails had “maliciously” undermined the defence and security relationship with the US.

“I hope if we can identify the individual, either the full force of internal discipline – or if necessary the law – will be brought to bear because this sort of behaviour has no place in public life,” he said. Read more

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