Three Tory Remainer MPs today sensationally quit in a bid to sabotage Brexit.

According to The Sun, Anna Soubry, Sarah Wollaston and Heidi Allen all walked out this morning to join Labour rebels in the new Independent Group.

The drastic move plunges the PM into chaos by slashing her tiny majority even further, making her more reliant on the Democratic Unionist Party (DUP).

Mrs May said she was “saddened” by the dramatic development and insisted she was “doing the right thing” by delivering on Brexit.

All three rebels are fiercely anti-Brexit — despite the referendum majority — and have been lobbying for a second EU referendum.

They wrote in a letter to Mrs May: “We no longer feel we can remain in the party of a Government whose policies and priorities are so firmly in the grip of the [European Research Group] ERG and DUP.

“Brexit has redefined the Conservative party — undoing all the efforts to modernise it. There has been a dismal failure to stand up to the hard line ERG which operates openly as a party within a party, with its own leader, whip and policy.”

They claimed Brexit was the “final straw” and accused the PM of failing to reach out to Remainers in the wake of the 2016 referendum.

The trio concluded: “We believe there is a failure of politics in general, not just in the Conservative Party but in both main parties as they move to the fringes, leaving millions of people with no representation.

“Our politics needs urgent and radical reform and we are determined to play our part.”

They pledged to back the PM on “measures to strengthen our economy, security and improve our public services” but confirmed they would sit with the ex-Labour independents who walked out earlier this week.

Responding in a statement, Mrs May said: “I am saddened by this decision — these are people who have given dedicated service to our party over many years, and I thank them for it.

“Of course, the UK’s membership of the EU has been a source of disagreement both in our party and our country for a long time. Ending that membership after four decades was never going to be easy.

“But by delivering on our manifesto commitment and implementing the decision of the British people we are doing the right thing for our country. And in doing so, we can move forward together towards a brighter future.”

“I am determined that under my leadership the Conservative Party will always offer the decent, moderate and patriotic politics that the people of this country deserve.”

The three former Tories are the first non-Labour MPs to join the Independent Group which was launched on Monday and has been dubbed an “anti-Brexit party”.

It pushes the number of MPs in the group up to 11 — the same size as the Liberal Democrats.

And Mrs May’s Commons majority has been cut to just eight, combining the Tories and DUP.

If more Conservative MPs walked out the PM would lose her majority altogether — potentially triggering a General Election.

The Tory trio had been in talks with Labour rebels Chuka Umunna and Chris Leslie over the court of this week.

Welcoming them to the group, Mr Leslie said: “MPs putting their country and constituents ahead of the broken political parties.”

The Independent Group is now sitting in parliament and plans to launch a fully fledged new party later this year.