Donald Trump said 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," Mr 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 Mr 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.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
Mr Trump lashed out at May, calling her handling of Brexit a "mess".
"I have been very critical about the way the UK and Prime Minister Theresa May handled Brexit," Trump tweeted. "What a mess she and her representatives have created. I told her how it should be done, but she decided to go another way."
"The good news for the wonderful United Kingdom is that they will soon have a new Prime Minister," Trump wrote.
