Up to 20 politicians, elected in 2019, apparently plan to submit letters of no confidence in the Prime Minister.
Although it's not clear if that'll push the total to 54, enough to trigger a vote on his future.
Analysis by The Times shows that 58 Tory MPs have recently criticised the PM publicly.
That includes Runnymede and Weybridge MP Dr Ben Spencer and Wimbledon’s Stephen Hammond.