In the May 2018 cable published by the Mail on Sunday, U.K. Ambassador Kim Darroch called Trump's decision to abandon the international accord "an act of diplomatic vandalism, seemingly for ideological and personality reasons" because the pact "was Obama's deal."

He the situation that has followed his criticism of the Trump administration has made it "impossible" to do his job as he would like.

The U.S. president also took aim at British Prime Minister Theresa May, calling her handling of Brexit "foolish."

The memos from Kim Darroch, ambassador to Washington, were divulged to a Sunday newspaper, annoying Trump and embarrassing London.

The British government was hunting Monday for the source of a leak of diplomatic cables from Britain's ambassador in Washington that branded President Donald Trump's administration "dysfunctional'' and "inept.''

Britain's Foreign Office did not challenge the authenticity of the leaked documents, which covered the period of 2017 to the present.