Donald Trump has backed calls for Nigel Farage to be appointed Britain's ambassador to the US, saying he would do a "great job".
The president-elect said that "many people" wanted to see the interim Ukip leader as the UK's top diplomat in Washington.
Mr Trump's endorsement is likely to cause fresh embarrassment for the Prime Minister who was beaten to meeting the future president in person by Mr Farage.
The tycoon tweeted: "Many people would like to see @Nigel_Farage represent Great Britain as their Ambassador to the United States. He would do a great job!"
Following Mr Trump's shock election victory Mr Farage said Theresa May's refusal to bring him in as a go-between with the president-elect was "nonsense" and urged her to set aside "petty personal differences".
Mr Farage said he had "some connections" and he would "like to help".
The Ukip stalwart attended a rally with Mr Trump during the election campaign and Mr Trump described a victory as "Brexit plus plus plus" on the eve of the vote.
Days after his victory the pair appeared together in a golden lift following a private meeting at the president-elect's New York residence, Trump Tower.
By comparison Mrs May had only spoken to Mr Trump over the phone, after reportedly waiting for a string of other leaders to congratulate the winner.
However No 10 rejected suggestions Mr Farage could be the "third person" in the relationship between the PM and her US counterpart and insisted that the Government had "well-established" channels of communication.