Downing Street has launched a robust defence of Lord Peter Mandelson, following a vicious attack on him by a Donald Trump ally.

The Labour peer will be the next UK ambassador to the United States, replacing Dame Karen Pierce.

Sir Keir Starmer’s choice, however, went down like a lead balloon among one person close to the incoming US President.

Chris LaCivita, a top Trump aide, was scathing in his criticism of the former Hartlepool MP.

He described the Labour government in a social media post as “special” — saying it had “replaced a professional universally respected Ambo with an absolute moron — he should stay home! SAD!”

However, No 10 hit back strongly, describing Lord Mandelson as a “significant asset” to diplomacy.

A spokesperson for Sir Keir said: “His appointment shows just how seriously we’re taking this relationship.

“He has got extensive foreign policy and economic policy expertise, particularly in the crucial issues of trade, business links.

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“Doesn’t Starmer read the CVs of his appointees? Reeves, Rayner, Lammy, Louise Heigh and now Mandelson. He certainly knows how to pick them.” 29

“Labour says Mandelson is a significant asset; Trump campaign manager says he’s an …” 25

“If the US doesn’t believe in Mandy, he is not the right person for the job.” 23

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“He’s got experience at the highest levels of government and it will be a significant asset in the UK’s relationship with the United States.”

The Labour peer will take up his post in early January and will be tasked with forging close links with the new Trump administration.

Relations between Trump and the Labour Party hit rock bottom during the US election campaign.

Trump’s team accused Labour of “blatant foreign interference”, filing a complaint with the Federal Election Commission (FEC).

They alleged that Labour Party activists were campaigning directly for Kamala Harris and her running mate Tim Walz.