A DOZEN Tory MPs are poised to submit letters of no confidence in the PM.
The threat emerged as one leading rebel met backbenchers who are fearful of losing their seats over Partygate.
A source said: “There’s concern MPs return after the Jubilee and have no option but to fold after speaking to constituents.”
Ex-health minister Steve Brine and Anne Marie Morris submitted letters to 1922 group chair Sir Graham Brady.
Critic David Davis said his colleagues “see their own seats disappearing” over No10 rule-breaking.
Ex-Justice Secretary Robert Buckland says defeats in June by-elections will trigger changes.
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The 1922 Committee is the vehicle for Tory MPs to oust a prime minister.
It takes letter of no confidence from 15 per cent of Conservative MPs to trigger a leadership vote.
This means 54 letters are currently required.