Sir Keir Starmer has congratulated Donald Trump on his “historic election victory”.
The Prime Minister said the special relationship between the UK and the US will “continue to prosper”.
Sir Keir will be keen to build bridges with Mr Trump after the Republican politician’s campaign filed a legal complaint about Labour activists supporting Democrat Kamala Harris.
The PM said: “I look forward to working with you in the years ahead. As the closest of allies, we stand shoulder to shoulder in defence of our shared values of freedom, democracy and enterprise.
“From growth and security to innovation and tech, I know that the UK-US special relationship will continue to prosper on both sides of the Atlantic for years to come.”
Foreign Secretary David Lammy, who has been a vocal critic of Mr Trump in the past and once branded him as a “racist KKK and Nazi sympathiser”, also congratulated the Republican.
He said: “The UK has no greater friend than the US, with the special relationship being cherished on both sides of the Atlantic for more than 80 years.
“We look forward to working with you and JD Vance in the years ahead.”
It comes after Mr Trump declared he has won a “magnificent victory for the American people” after victories in key swing states.
Addressing a campaign party in Florida in the early hours of Wednesday, Mr Trump told his supporters that “America has given us an unprecedented and powerful mandate”.
He said that he would not let his backers down and that it is “time to put the divisions of the past four years behind us”.
The 78-year-old pledged to “fight” for “every citizen” and promised the “golden age of America”.
He said: “Every single day I will be fighting for you with every breath in my body.
“I will not rest until we have delivered the strong, safe and prosperous America that our children deserve, and that you deserve.”
He added: “This is a magnificent victory for the American people that will allow us to make America great again.”
Minutes before he took to the stage, it was projected that Mr Trump had won in the state of Pennsylvania, after victories in North Carolina and Georgia, swing states where the race with his Democrat rival has been closely fought.
