LONDON (AP) — The Latest on Britain's historic vote to leave the European Union (all times local):

10:50 a.m.

A senior figure of the British Labour Party says embattled party leader Jeremy Corbyn won't step down despite internal opposition.

John McDonnell told the BBC Sunday that "Jeremy's not going anywhere."

McDonnell is the party's shadow chancellor and a top adviser to Corbyn.

He says Corbyn was elected party leader nine months ago with "the biggest mandate of any political leader in our country."

He says Corbyn still enjoys wide party backing from the rank and file members who voted him in.

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10:30 a.m.

European Parliament President Martin Schulz wants Britain to officially apply for an exit from the European Union already by Tuesday, following its vote to leave the bloc.

Schulz told weekly Bild am Sonntag Sunday that "we now expect the British government to deliver. The summit on Tuesday is the right moment for this."

Top EU officials have repeatedly pressed Britain for a quick exit to avoid a period of uncertainty for the remaining 27 EU countries.

The victorious "leave" campaigners in Britain have said there's no rush to trigger Article 50 of the EU's Lisbon Treaty, which will begin a two-year exit process to renegotiate trade, business and political links between the U.K. and the EU.

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8:50 a.m.

Britain's shadow health secretary has resigned from the shadow cabinet amid a dispute over Labour leader Jeremy Corbyn's leadership in the aftermath of Britain's vote to leave the European Union.

The Press Association reported Heidi Alexander announced her resignation Sunday, shortly after Corbyn fired shadow foreign secretary Hilary Benn.

The BBC reports that up to half of the shadow cabinet is set to resign in a bid to force Corbyn to step down.

The opposition leader has faced accusations from his own lawmakers that he led a weak campaign in Britain's EU referendum and is facing a motion of no confidence.

The Observer newspaper reported Sunday that Benn has been plotting against Corbyn.

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8:40 a.m.

U.S. Secretary of State John Kerry will visit Brussels and London on Monday as the world grapples with the implications of Britain's historic vote to leave the European Union.

Kerry will bring messages of American support to both places Monday.

In Brussels, he will meet the 28-nation bloc's foreign policy chief Federica Mogherini. In Britain, he will see Foreign Secretary Philip Hammond.

Kerry arrived in Rome on Sunday for scheduled talks with Israeli Prime Minister Benjamin Netanyahu.

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8:30 a.m.

British Labour party leader Jeremy Corbyn has fired his shadow foreign secretary amid a dispute over his leadership in the aftermath of Britain's vote to leave the European Union.

Hilary Benn told the Press Association Sunday that Corbyn dismissed him after he told him he had lost confidence in his ability to lead the party.

Benn said that "following the result of the EU referendum, we need strong and effective leadership of the Labour Party that is capable of winning public support."

The dismissal follows claims in the Observer newspaper that Benn was plotting against Corbyn.

The opposition leader has faced accusations from his own lawmakers that he led a weak campaign in Britain's EU referendum and is facing a motion of no confidence.