Sir Keir Starmer could face a vote of no confidence as the Liberal Democrats eye up “joining forces with the Tories” to topple the Prime Minister.

After Kemi Badenoch confirmed she was considering such a vote in the Prime Minister, the Liberal Democrat leader Sir Ed Davey announced this afternoon he would support her decision to do so.

On Thursday, it was revealed the Foreign Office gave Peter Mandelson security clearance despite the ex-Cabinet Minister failing the vetting process.

Following the fallout, the PM insisted he was unaware that his ex-ambassador the US had failed the security checks. Downing Street claimed Sir Keir was only made aware on Tuesday.

But No10’s denial has failed to quieten the deafening cries for the Prime Minister to step down from his role.

And, now, parties across Westminster have said they are willing to work together to oust Sir Keir from his premiership.

This afternoon, the Kingston & Surbiton MP told GB News: “We don’t have any confidence in the Prime Minister.

“That’s why we’re calling for his resignation. His story just doesn’t stack up.

“I don’t think people can be expected to believe that his national official went totally rogue on this issue of national importance, or that he didn’t consider checking the evidence in the months after Peter Mandelson resigned.”

On Sir Keir’s accountability over the ongoing scandal simmering away along Downing Street, he said: “He Prime Minister shouldn’t be blaming his staff. He should take responsibility himself.”

Last night, shortly before news of Sir Olly Robbins’s Foreign Office exit emerged, Mrs Badenoch and Sir Ed, along with Nigel Farage and Zack Polanski all called on the PM to resign.