Two vice chairs of the Conservative Party, Maria Caulfield and Ben Bradley, are quitting their posts in protest at Theresa May’s Chequers Brexit compromise plan.
Both have warned they will lose their seats unless the Tories deliver Brexit.
Ms Caulfield supported Leave in the EU referendum, and Mr Bradley backed Remain.
Foreign Secretary Boris Johnson and Brexit Secretary David Davis have already quit.
Tory vice chairs quit over Brexit}