Boris Johnson Quits Amid Brexit Crisis
Boris Johnson has resigned as Foreign Secretary amid a growing political crisis over the UK's Brexit strategy.
He is the second senior cabinet minister to quit within hours following Brexit Secretary David Davis's exit.
His departure came shortly before Theresa May began addressing Parliament about her new Brexit plan, which has angered many Conservative MPs.
She said she did not agree with the two ex-ministers about “the best way to honour” the result of the 2016 vote.
The BBC's political editor Laura Kuenssberg said Mr Johnson's exit had turned an “embarrassing and difficult situation for the PM into potentially a full-blown crisis”, fuelling speculation about a leadership challenge.
Ahead of a meeting of Tory MPs at 17.30 BST, Mrs May's official spokesman said she would fight any attempt to oust her if the required 48 Tory MPs called for a contest.
The UK is due to leave the European Union on 29 March 2019, but the two sides are yet to agree how trade will work between the UK and the EU afterwards.
There have been differences within the Conservatives over how far the UK should prioritise the economy by compromising on issues such as leaving the remit of the European Court of Justice and ending free movement of people.
Theresa May only has a majority in Parliament with the support of the 10 MPs from Northern Ireland's Democratic Unionist Party, so any split raises questions about whether her plan could survive a Commons vote.
By the BBC's Laura Kuenssberg
For a long time it had been clear Boris Johnson was not happy with the prime minister's Brexit strategy.
His dissatisfaction was more than just the odd off-colour remark, although goodness knows there were enough of them.
His departure is a huge story and turns what might have been a couple of days of significant turmoil, into a significant crisis for Theresa May and for the whole Brexit project.
He was Brexit's main cheerleader, the politician most associated with making it happen, and one of the best known politicians in the country, for good or ill.
Mr Johnson, who has been foreign secretary since June 2016, had been due to attend a summit on the future of the Western Balkans in London but did not show up – fuelling rumours about his imminent departure.
His resignation was confirmed just minutes before Mrs May's Commons statement.
Mr Johnson has yet to explain the reasons for his departure and, as yet, has not even left the Foreign Office
Speaking in a boisterous House of Commons, Mrs May paid tribute to Mr Johnson's “passion” in championing a global Britain after Brexit and Mr Davis' work in steering through key Brexit legislation.
But she told MPs: “We do not agree on the best way to deliver our shared commitments to honour the result of the referendum.”
Mrs May told MPs that the plan agreed by the cabinet at Chequers was the basis of a “responsible and credible” offer to restart renegotiations with the EU.
She said she had listened to “every possible version” of Brexit over the past two years and what she was proposing was the “right Brexit” that would respect the referendum commitments on money, borders and laws but also protect the economy and ensure a “smooth” departure.
But she warned that if the EU did not engage with her plan, there was a “serious risk” of the UK leaving in March 2019 without a deal in a “disorderly” manner.
Labour leader Jeremy Corbyn said Mr Johnson and Mr Davis had abandoned a “sinking ship”, shattering the the “illusion of unity” initially surrounding the Chequers plan.
“The Chequers compromise took two years to reach and two days to unravel,” he said. “We have a crisis in government… it is clear this government cannot secure a good deal for Britain.”
Mrs May came under pressure from prominent Tory Brexiteers on the backbenches, with ex-leader Iain Duncan Smith urging her to rule out further concessions during the talks.
And John Redwood said she must clear up “ambiguities and contradictions in the Chequers statement that implies we would give the European Court of Justice powers, we might pay money to trade, we might accept their laws and have their migration policies”.
Former Tory chairman Grant Shapps, who last year called on Mrs May to consider her position, said it was the wrong time for a leadership contest and he hoped it would not happen.
He told the BBC a contest would take three months and “we physically do not have the time for that” given the state of negotiations and the need for a deal by October.
But former UKIP leader Nigel Farage said the ex-mayor of London had the chance to “save Brexit” by moving against the prime minister.
The European Commission declined to comment on Mr Davis's exit but Donald Tusk, the president of the European Council, said he hoped a change in faces might lead to a change in policy.