Sir Keir Starmer's leadership woes have triggered fears among the UK's allies ahead of the G7 summit in Evian today.
The Prime Minister will meet with US President Donald Trump today as Greater Manchester Mayor Andy Burnham plots to mount a coup of No10 following the Makerfield by-election on Thursday.
A devastating double resignation – spearheaded by ex-Defence Secretary John Healey and former Armed Forces Minister Al Carns – heaped pressure on Sir Keir ahead of the summit.
However, US officials have become increasingly concerned about Mr Burnham becoming Prime Minister.
“Starmer is seen as a reasonable choice for now, given the further-left alternatives,” one US official told Politico.
“Wherever that [relationship with Trump] stands at any given moment, it’s a lot deeper than what something with Burnham might be.”
An Eastern European diplomat added: “Weak domestically is eventually weak abroad.
"All politicians treat foreign policy as a spare lung, but it rarely works.”
A spokesman for Sir Keir said: “In these volatile times, it’s more important than ever that we’re working with our partners to keep people safe and secure at home.”
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Andy Burnham's popularity nosedives with Makerfield election just TWO days away - yet Labour leadership hopeful remains top of the list
Andy Burnham's popularity has taken a nosedive with the Makerfield by-election just two days away - yet the Labour leadership hopeful has remained the most popular politician.
The pollsters at Ipsos revealed his approval rating sat at minus seven per cent, dropping 15 per cent since May.
Keir Starmer set to face presidential grilling as Donald Trump prepares to confront Prime Minister on immigration
Sir Keir Starmer is set to face a presidential grilling as Donald Trump is preparing to confront the Prime Minister on immigration.
The direct confrontation will follow the violent chaos in Belfast last week, following the attempted beheading of a man in the city by a 30-year-old Sudanese man.
PICTURED: World leaders meet in Evian, France for G7 summit
Keir Starmer tells Vladimir Putin to 'roll back tanks' in bold invitation to G7 talks on peace in Ukraine
Sir Keir Starmer has told Vladimir Putin to "roll back his tanks" as he extended a bold invitation to the Russian President to join G7 talks on peace in Ukraine.
The Prime Minister said: "Russia's aggression threatens not just Ukraine, but the security of all Europe.
"That is why the UK is stepping up – choking off the revenues that fuel Putin’s war and powering Ukraine through the winters ahead.
"We will stand with Ukraine for as long as it takes and this announcement reinforces that. Putin should roll back his tanks, end his barbaric strikes, and come to the negotiating table."
Elon Musk issues chilling free speech message over Keir Starmer's social media ban
Elon Musk has launched a scathing attack on Labour's forthcoming prohibition on social media use for children under 16.
The tech billionaire, who recently became the world's first trillionaire, took to his platform X to denounce the policy.
He branded the UK a "police state" in response to the measures announced by Sir Keir Starmer.
Mr Musk later added: "This censorship law is a wolf in sheep's clothing. The real goal is to enable the UK government to track everyone."
Ministers plead with Donald Trump not to attack Keir Starmer for 'police state' internet clampdown
Ministers have been pleading with Donald Trump not to attack Sir Keir Starmer over his social media ban.
Both world leaders are currently in France for the G7 summit, which is thought to follow a long-winded lobbying campaign from Labour's top brass to avoid backlash from the White House.
Ministers said they have spent weeks trying to reassure US officials the social media ban was not specifically aimed at US tech firms.
It limits access to platforms including X, YouTube, Facebook, Snapchat and TikTok for under-16s.
All but X and TikTok are American-owned, and all are headquartered in the US.