Boris Johnson has managed to survive a vote of no confidence, although more than a third of his MPs have turned on him.
The PM clawed together enough support to stay in power but was humiliated by the extent of the rebellion against him.
More than 40% of his own MPs wanted him out - a worse result than Theresa May suffered in a no confidence ballot in 2018.
She resigned five months after that bombshell vote.
However, Mr Johnson has repeatedly refused to step down, despite a string of damning Partygate revelations and the worsening cost of living crisis.
Following last night's vote, Education Secretary Nadhim Zahawi insisted that Mr Johnson had won "handsomely" and said the Conservative Party had to unite to win the next election.
Meanwhile, Labour leader Sir Keir Starmer criticised Tory MPs for failing to boot the PM out and said he was "unfit for the great office he holds".
Jason Beattie, the Daily Mirror's Head of Politics, shares his take on the no confidence vote below:
Boris Johnson’s past caught up with him last night.
The great escapologist, who has spent his life evading one scandal after another, was finally cornered.
Despite all the arm-twisting, promises of promotion and threats by his supporters, nearly two thirds of Conservative backbenchers have concluded enough is enough.
Too many times they had heard his pledges to do things differently.
They were no longer believed his claims he could turn things around or that he would prove his detractors wrong.
They realised, like his long-suffering former wives and partners, that he will cheat on them again.
And again.
None of this should have been a surprise.
All the reasons why Johnson was unsuitable to be Prime Minister - his incompetence, dishonesty, rule breaking and monstrous self-regard - were obvious before they elected him leader.
The only thing in his favour was an ability to appeal to voters other Conservatives struggled to reach.
This Heineken quality served Johnson well up to the point his reputation became flat, stale and distasteful.
With a few honourable exceptions, the majority of Tory MPs did not drive him from office for the honourable reason of wishing to restore dignity in Downing Street.
They did so because he had gone from being an electoral asset to ballot box poison.
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The Prime Minister will try to limp on but he will struggle to shake the sense of doom that now engulfs his premiership.
Losses in the Tiverton & Honiton and Wakefield by-elections could seal his fate. Even if he survives those hurdles he will be leader of a party that is ungovernable.
If 148 Tory MPs think he is unfit to be leader how can he persuade the rest of the country otherwise?
The Tories are now paying the price for their dalliance with Johnson.
It is party with no direction, no longer confident of what it stands for and riven by infighting.
