Nick Boles has left his local Conservative association after a rift over his stance on a no-deal Brexit.
The senior Conservative MP has campaigned against leaving the EU without a deal, instead calling for a closer Norway-style relationship with Europe.
However, a large proportion of local activists in the Grantham and Stamford Conservative Association are in favour of a no-deal, and want him to be dumped as the party's candidate in the next general election.
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A senior official at Mr Boles' local association said they had been "betrayed" and called on Mr Boles to take the "honourable course" and quit as an MP.
In a letter to members obtained by the BBC, Mr Boles said "a division has opened up between me and members of the association executive", adding: "Many of them are convinced that the government should take the UK out of the European Union without a deal.
"I am certain that crashing out of the EU without a deal would do great harm to the British people and have done everything in my power to prevent it."
Despite the feud, Mr Boles says he will stay on as MP for Grantham and Stamford.