Two vice-chairs of the Conservative Party are quitting their posts in protest at Theresa May's Chequers Brexit compromise plan.
Maria Caulfield and Ben Bradley warned the PM her plan would not capitalise on the opportunities of Brexit. "This policy will be bad for our country and bad for the party," Ms Caulfield said.
Foreign Secretary Boris Johnson and Brexit Secretary David Davis have already quit over the proposals. Mrs May says the proposed new relationship with the EU will "honour the result of the referendum" and allow the UK to "take back control of our borders, our law and our money".
It would see the UK agreeing a "common rulebook" with the EU for trading in goods, in an attempt to minimise friction for trade at borders.
But some Tories are unhappy, saying it will leave the UK tied closely to EU rules and prevent it from striking its own trade deals in years to come. More details are expected on Thursday in a White Paper.