Tory MP Nick Boles, who quit his local party on Saturday over his stance on Brexit, says his priority lies with his constituents and he will not be “bossed around by a small number of people”.
He told the Andrew Marr Show he thought about standing as an independent MP.
But he said he had decided to remain as he was not “ready to give up on the Conservative Party yet”.
Mr Boles, MP for Grantham and Stamford, has been an outspoken critic of leaving the EU with no deal.
The MP – who is in favour of a closer Norway-style relationship with Europe – said he was “proud” of his role in the cross-party campaign to force the prime minister to request an extension to Article