Britain's opposition Labour Party leader Jeremy Corbyn is facing a coup. Dominic Lipinski / PA Wire/Press Association Images Labour leader Jeremy Corbyn has said he will not be moved from the leadership despite a full-scale coup against him by the parliamentary Labour party, which began on Sunday with 11 resignations from his shadow cabinet.

In a statement, Corbyn said, "I regret there have been resignations today from my shadow cabinet. But I am not going to betray the trust of those who voted for me – or the millions of supporters across the country who need Labour to represent them."

The revolt began after he fired shadow foreign secretary Hilary Benn.

Eleven other members of the shadow cabinet resigned on Sunday after Benn was fired in a midnight phone call. Corbyn's decision followed reports that Benn was staging a coup.

The members that have quit include:

Chris Bryant (shadow culture secretary);

Lord Falconer (shadow justice secretary);

Karl Turner (shadow attorney general);

Heidi Alexander (shadow health secretary);

Ian Murray (shadow Scottish secretary);

Gloria De Piero (shadow minister for young people and voter registration);

Lilian Greenwood (shadow transport secretary);

Lucy Powell ( shadow education secretary);

Kerry McCarthy (shadow environment secretary);

Seema Malhotra (shadow treasury secretary);

Vernon Coaker (shadow Northern Ireland secretary.)

Crucially, deputy leader Tom Watson is sitting on the fence — neither resigning nor supporting Corbyn. All through Saturday, Watson replied to tweets urging him to support Corbyn by CC-ing them to Jon Lansman, the head of the Momentum movement that got Corbyn elected. It was not clear whether he was doing that to reassure Lansman of his support for Corbyn or to illustrate to Lansman the level of pressure he was under on Twitter. This tweet suggests the two do not see eye to eye.

Photos of members of Jeremy Corbyn's shadow cabinet who have today resigned (top row, left to right) Ian Murray, Gloria De Piero, Kerry McCarthy, Heidi Alexander and Lord Falconer. (bottom row, left to right) Lucy Powell, Lilian Greenwood, Seema Malhotra, Vernon Coaker and Karl Turner. PA / PA Wire/Press Association Images

Corbyn is facing one of the biggest battles to retain his role in the party after a number of MPs signed a letter saying they had no confidence in his leadership anymore.

"I think the European referendum was a test of leadership and Jeremy failed that test," Labour MP Margaret Hodge, who submitted the no-confidence motion on Friday, told Sky News.

The Labour Party campaigned for Remain during the referendum, but MPs say Corbyn's heart wasn't in it. Britain voted to leave the EU by a vote of 52% to 48%.

This chart shows just how many Labour voters opted for a Brexit:

"I told Jeremy Corbyn last night that I no longer had confidence in his leadership and he dismissed me from the shadow cabinet," Benn told Sky News on Sunday morning.

Shadow health secretary Heidi Alexander was the first to step down, tweeting her resignation letter.

She writes: “As much as I respect you as a man of principle, I do not believe you have the capacity to shape the answers our country is demanding and I believe that if we are to form the next government, a change of leadership is essential.”

She told ITV's "Peston on Sunday" that "a fair number of people feel similar" to her, but wouldn't say how many shadow-cabinet members are expected to resign.

—Peston on Sunday (@pestononsunday) June 26, 2016

Alexander was considered a more "moderate, practical, pragmatic voice," a Labour source told The Guardian, which makes her decision to quit significant. Benn, on the other hand, has "always had a problem with Corbyn," the source said.

Corbyn was close to firing Benn in January after the shadow foreign secretary voted to extend RAF airstrikes against ISIS in Syria.

When asked on the "Andrew Marr Show" on Sunday morning if there would be more resignations, Benn said it was "for each individual to make their decision."

But there are many signs of a full-stage coup.

One cabinet member told The Guardian: “A bad-tempered sacking is likely to lead to more trouble for Jeremy.”

However, shadow chancellor John McDonnell said that Corbyn is "not going anywhere" on the BBC.

"There will be no resignation of a democratically elected leader with a strong mandate from the membership," a Labour spokesman told Sky News.

The public is already placing bets on the next Labour leader. Two women, Caroline Flint and Jess Phillips, are quickly becoming the candidate frontrunners.

You can read more of the resignation letters below.

Shadow Scottish secretary Ian Murray:

Shadow transport secretary Lilian Westwood:

Shadow education secretary Lucy Powell:

—Lucy Powell MP (@LucyMPowell) June 26, 2016