Sir Keir Starmer has been left bracing for a no-confidence vote after almost 100 Labour MPs called on the Prime Minister to resign.
Dave Doogan, who this week replaced Stephen Flynn as the Scottish National Party's leader in Westminster, this morning threatened to force a vote on Sir Keir's future following the King's Speech.
Mr Doogan is urging Cabinet ministers to end the crisis engulfing No10 by making the Prime Minister's position untenable.
The Angus & Perthshire Glens MP vowed to table a motion of no-confidence if Labour MPs fail to force Sir Keir out of Downing Street.
Speaking ahead of the King's Speech, Mr Doogan said: “This farce has to end now so Parliament can focus on the issues that really matter.
“It’s clear the only way that can happen is for Keir Starmer to go.
“He has lost the confidence of voters and his own MPs, and there’s no coming back from that.
“The Labour Party must stop dragging this crisis out and put an end to it now.
Sir Keir Starmer could soon face a no confidence vote
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“If the Labour Cabinet ministers don’t have the decency to do the right thing – then Parliament must.
“Unless they put an end to this chaos now, the SNP will table a motion of no confidence in Keir Starmer to draw things to a close.”
Sir Keir was handed the keys to No10 after securing a thumping 174-seat majority in the 2024 General Election.
However, a series of revolts have slowly whittled away the Prime Minister's authority.
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King Charles will deliver his King's Speech imminently
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More than 90 Labour MPs have now called on Sir Keir to step down, wiping out the Prime Minister's majority in the House of Commons.
However, it remains unlikely that Labour MPs would want to force a snap general election by voting in favour of the SNP's amendment.
The last successful vote of no confidence was held in 1979, when a cabal of so-called "Tartan Tories" ensured James Callaghan lost by just one vote.
Meanwhile, Stanley Baldwin was forced to hold a snap general election in 1924 after an amendment of no confidence to the King's Speech was passed.
Dave Doogan (left) is threatening to table a motion of no confidence
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A number of Prime Ministers have also faced down attempts to force an early general election, including Theresa May and Boris Johnson.
However, Labour still languishes behind Reform UK in the polls, with Nigel Farage's party picking up more than 1,400 council seats in last week's local elections.
Despite admitting Sir Keir's support has slumped, a letter signed by more than 100 Labour MPs has urged colleagues in the Commons to back the Prime Minister.
The letter, which was released following the announcement that 10 Labour MPs had resigned from the frontbench, warned: "This is no time for a leadership contest."
Sir Keir Starmer vowed to push on in a meeting with his Cabinet colleagues
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Health Secretary Wes Streeting, who is seen as a main challenger to Sir Keir, met with the Prime Minister for a crunch No10 meeting ahead of the King's Speech this morning.
Mr Streeting is now being tipped to announce his resignation as early as tomorrow in a move which would likely trigger a leadership contest.
Meanwhile, Greater Manchester Mayor Andy Burnham was in London yesterday amid speculation he had found a seat to contest in a by-election as part of his plot to secure the keys to No10.
Ex-Deputy Prime Minister Angela Ranyer and Energy Secretary Ed Miliband have also been ringing around for support from Labour MPs.