Donald Trump has criticised the outgoing British Prime Minister Theresa May, accusing her of creating a Brexit "mess".
The US president also said the US will "no longer deal with" the British ambassador following the leak of scathing remarks about the Trump administration.
President Trump tweeted his comments amid the ongoing Conservative leadership contest in the UK.
Boris Johnson and Jeremy Hunt are currently attempting to win over party members, who are voting in the final leadership ballot.
The winner will be announced in two weeks, with Mrs May remaining as caretaker prime minister until then.
In a pair of tweets this afternoon, President Trump said it's "good news" that the UK will soon have a new prime minister.
He claimed: "I have been very critical about the way the UK and Prime Minister Theresa May handled Brexit. What a mess she and her representatives have created.
"I told her how it should be done, but she decided to go another way."
President Trump also said he was "most impressed" with Queen Elizabeth during his recent state visit to the UK.
In the tweets, he also again referenced the diplomatic spat with the British ambassador to the US which has broken out following a leak of sensitive memos.
In the memos, published by the UK's Mail on Sunday yesterday, Kim Darroch described the US president as "incompetent", "inept" and "insecure".
He also offered a scathing assessment of the Trump White House, saying it had become "uniquely dysfunctional" because of "vicious infighting and chaos", and questioned whether it "will ever look competent".
Today, President Trump claimed Mr Darroch is "not liked or well thought of within the US" - adding that they will no longer deal with him.
Earlier, Mrs May's spokesperson said her government has 'full faith' in Mr Darroch - but did not agree with his assessment of President Trump.
In a statement quoted by the BBC, the spokesman said the job of ambassadors is to offer "honest and unvarnished opinions".
He added: "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."