Theresa May Faces Mutiny Over Brexit Deal

British Brexit Secretary Dominic Raab has resigned, thrusting Prime Minister Theresa May's government into turmoil after she clinched a Brexit deal that was mauled by opponents, allies and mutinous members of her party.

"I regret to say that, following the Cabinet meeting yesterday on the Brexit deal, I must resign," Raab said.

May's plan threatened the integrity of the United Kingdom, he said.

"I cannot reconcile the terms of the proposed deal with the promises we made to the country in our manifesto at the last election. This is, at its heart, a matter of public trust."

Former Brexit Secretary Dominic Raab. Image: AAP

Also Thursday, Shailesh Vara quit as minister of state for Northern Ireland, saying he cannot support May's agreement, which he said "leaves the UK in a halfway house with no time limit on when we will finally be a sovereign nation".

READ MORE: Theresa May Wins Brexit Parliament Vote, Defeats Rebellion

European Union leaders will meet on November 25 to endorse the divorce deal.

May now faces the much more perilous struggle of getting parliament to approve the deal.

British journalists said anger among Brexit-supporting Conservative lawmakers was so high that they might call for a vote of no confidence in her leadership.

There was no confirmation.

Theresa May fights for her minister's support. Image. Getty Images.

ITV reporter Robert Peston said enough demands for a no confidence vote could be lodged by lunchtime on Thursday.

The ultimate outcome for the United Kingdom remains uncertain: scenarios range from a calm divorce to rejection of May's deal, potentially sinking her premiership and leaving the bloc with no agreement, or another referendum.