US President Donald Trump declared Monday he would have no further contact with Britain's ambassador to Washington, following the leak of diplomatic cables in which the envoy described him as "inept."

"I do not know the Ambassador, but he is not liked or well thought of within the U.S," Trump tweeted of Kim Darroch, as Britain scrambled to stem the damage to relations caused by the incident.

"We will no longer deal with him," added Trump, who hit out in a series of tweets at Theresa May and her "representatives," and welcomed the prime minister's impending departure from office.

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