The former cabinet minister and Brussels commissioner is a consummate political networker and his appointment will be seen by supporters as a masterstroke.
But he has also been one of the most divisive figures in British politics over many years and his appointment will be seen by Labour left-wingers as an act of cronyism by the PM.
Lord Mandelson had to resign from Tony Blair‘s cabinet twice, first over an undeclared bank loan and then over intervening in a passport application by a top Indian businessman.
A plum job
The Washington role, seen as the most glittering diplomatic post in the UK government, is due to become vacant when current ambassador Karen Pierce steps down early next year.
The perks of the job include the luxurious ambassador’s residence in Massachusetts Avenue, a magnificent Queen Anne mansion designed by top architect Sir Edwin Lutyens.
Lord Mandelson’s appointment is the first political rather than diplomatic appointment to Washington since Peter Jay, former prime minister James Callaghan’s son-in-law, in 1977.
Image: Mandelson alongside Tony Blair and Bill Clinton in Northern Ireland in 2000
Farage among big name backers
Sir Keir is said by insiders to believe he has the trade experience and networking abilities to boost UK interests in the US during the tricky period of a Trump second presidency – with the prospect of tariffs looming.
Crucially, he has become a close ally of Sir Keir’s new chief of staff, Morgan McSweeney, and is backed by Foreign Secretary David Lammy. It is claimed Lord Mandelson was seen in the Foreign Office last week.
And significantly, Reform UK leader Nigel Farage, just back from talks with Trump allies, has said Lord Mandelson is “a very clever man” who can “master his brief” and would be “respected” by the president-elect’s team.
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Trump’s threat of tariffs explained
The cap on a high-profile career
His appointment is not a total surprise. For the past month, he has been seen by Labour insiders as the clear frontrunner on a shortlist of four, also including former foreign secretary David Miliband.
The others were Baroness Ashton, also a former senior Brussels official, and Baroness Amos, a former international development secretary under Mr Blair.
Mr Miliband’s name was touted by Sue Gray, Sir Keir’s now ousted chief of staff, while Baronesses Amos and Ashton, who have strong links to the Democrats, were seen as a good fit if Kamala Harris had won the presidential election.
For Lord Mandelson, the appointment is likely to cap a high-profile political career which began as a TV producer and then Labour’s director of communications under Neil Kinnock in 1985.
Image: Mandelson was a speechwriter for former Labour leader Neil Kinnock
‘A fighter, not a quitter…’
He was seen as a brilliant if ruthless spin doctor, who masterminded the birth of New Labour but would berate newspaper editors when unfavourable stories were written by their political journalists.
He became MP for Hartlepool in 1992 and helped propel Mr Blair to the leadership of the party after John Smith’s death in 1994, a move that led to a bitter feud with Gordon Brown.
Then he got his first cabinet job, trade and industry secretary, in 1998, but was forced to quit months later after failing to declare a home loan from Labour millionaire Geoffrey Robinson to his building society.
He bounced back as Northern Ireland secretary in 1999, but was forced to resign a second time over claims he helped businessman Srichand Hinduja with an application for UK citizenship.
When he held his seat in Hartlepool in the 2001 general election, he made a passionate and defiant victory speech in which he declared: “I’m a fighter, not a quitter.”
Image: Mandelson was MP for Hartlepool from 1992 until 2004
…until he was
Yet three years later he did quit as an MP, when he became a trade commissioner in Brussels, which supporters in his new post claim gave him vital experience in trade talks with president-elect Trump.
But in his most spectacular political comeback until now, in 2008 his old foe Gordon Brown, by now prime minister but facing challenges to his leadership, brought him back as business secretary with a peerage.
A year later Mr Brown awarded him the grand title, previously held by Michael Heseltine under John Major, of first secretary of state, a position he held until Labour’s election defeat in 2010.
Image: Mandelson was brought back into the fold by Gordon Brown ahead of the 2010 election
Blair’s famous quote
But he was very much a Blairite rather than a soulmate of Mr Brown. And in the run-up to Sir Keir’s election victory this year he was back in the fold, offering advice on campaigning and policy.
Acknowledging that Mr Mandelson was a controversial and divisive figure, Mr Blair declared in 1996: “My project will be complete when the Labour Party learns to love Peter Mandelson.”
Clearly the current Labour leadership loves him sufficiently to hand him this plum job, though many on the left of the party will be furious about his appointment.
The government has vowed to push for a “major new crackdown” on people smuggling gangs with a £100m cash boost for border security.
The investment will support the pilot of the new “one in, one out” returns agreement between the UK and France, and other efforts to crack down on small boat crossings.
Home Secretary Yvette Cooper said this new funding will “strengthen” the government’s “serious and comprehensive plan” to dismantle the business model of criminal gangs smuggling migrants across the Channel.
But the Conservatives have claimed the cash injection will make “no real difference”, with shadow home secretary Chris Philp branding the move a Labour “gimmick” and a “desperate grab for headlines”.
The funding will pay for up to 300 new National Crime Agency (NCA) officials, “state-of-the art” detection technology and new equipment to “smash the networks putting lives at risk in the Channel”, ministers say.
It will also allow the Border Security Command, the NCA, the police and other law enforcement agency partners to “strengthen investigations targeting smuggling kingpins and disrupt their operations across Europe, the Middle East, Africa and beyond”.
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July: 25,000 migrants have crossed Channel
The new investment comes as official figures show more than 25,000 people have arrived on small boats so far in 2025 – a record for this point in the year.
Ms Cooper said: “In the last 12 months, we have set the foundations for this new and much stronger law enforcement approach – establishing the new Border Security Command, strengthening the National Crime Agency and UK police operations, increasing Immigration Enforcement, introducing new counter terror style powers in our Border Security Bill, and establishing cooperation agreements with Europol and other countries.
“Now this additional funding will strengthen every aspect of our plan, and will turbo-charge the ability of our law enforcement agencies to track the gangs and bring them down, working with our partners overseas, and using state-of-the-art technology and equipment.
“Alongside our new agreements with France, this will help us drive forward our Plan for Change commitments to protect the UK’s border security and restore order to our immigration system.”
The £100m investment will also support new powers to be introduced when the Border Security, Asylum and Immigration Bill becomes law, the Home Office said.
This includes the introduction of a UK-wide offence to criminalise the creation and publication of online material that promotes a breach of immigration law, such as the advertisement of small boat crossings on social media.
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July: Hundreds gather for protest outside ‘migrant’ hotel
Research suggests about 80% of migrants arriving to the UK by small boat used internet platforms during their journey – including to contact agents linked to smuggling gangs.
While it is already illegal to assist illegal immigration, ministers hope the creation of a new offence will give police more powers and disrupt business models.
Mr Philp accused the Labour government of having “no serious plan, just excuses, while ruthless criminal gangs flood our borders with illegal immigrants”.
He said: “The British public deserves real action, not empty slogans and tinkering at the edges.”
Efforts to bring Gazan children to the UK for urgent medical treatment are set to be accelerated under new government plans.
Under the scheme, reportedly set to be announced within weeks, more injured and sick children will be treated by specialists in the NHS “where that is the best option for their care”.
It has been suggested that up to 300 children could arrive in the UK from Gaza.
A parent or guardian will accompany each child, as well as siblings if necessary, and the Home Office will carry out biometric and security checks before travel, the Sunday Times has reported.
It is understood this will happen “in parallel” with an initiative by Project Pure Hope, a group set up to bring sick and injured Gazan children to the UK privately for treatment.
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15:52
A 15-year-old boy from Gaza brought to the UK for urgent medical treatment this week has told Sky News of his joy and relief. Majd lost part of his face as well as his entire jaw and all his teeth in a tank shell explosion.
A government spokesperson said: “We are taking forward plans to evacuate more children from Gaza who require urgent medical care, including bringing them to the UK for specialist treatment where that is the best option for their care.”
More than 50,000 children are estimated to have been killed or injured in Gaza since October 2023, according to Unicef.
More from Politics
So far, three children have arrived in the UK for medical treatment with the help of the charity Project Pure Hope.
Around 5,000 have been evacuated in total, with the majority going to Egypt and Gulf countries.
Sir Keir Starmer said last week that the UK was “urgently accelerating” efforts to bring children over for treatment.
The government has also pledged another £1m to help the World Health Organisation in Egypt provide medical support to evacuated Gazans.
The prime minister told the Mirror: “I know the British people are sickened by what is happening.
“The images of starvation and desperation in Gaza are utterly horrifying. We are urgently accelerating efforts to evacuate children from Gaza who need critical medical assistance – bringing more Palestinian children to the UK for specialist medical treatment.”
Around 100 MPs have signed a letter urging the government to fast track the scheme.
Labour MP Stella Creasy, who co-ordinated the letter, said: “The commitment we all share to help these children remains absolute and urgent – with every day, more are harmed or die, making the need to overcome any barriers to increasing the support we give them imperative.
“We stand ready to support whatever it takes to make this happen and ask for your urgent response.”
Meanwhile, Project Pure Hope has been campaigning for months to create a scheme which would allow for the evacuation of 30 to 50 children.
The charity has raised the money to bring the children and their families to the UK, and cover their medical costs, privately.
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