Theresa May has warned her successor against pursuing a no-deal Brexit as the EU rebuffed the hopes of Tory leadership contenders by refusing to reopen talks.
Ms May told reporters in Brussels that the next Tory leader must "get a consensus" as the number of Conservatives jockeying to replace her reached double figures.
Foreign secretary Jeremy Hunt, one of the candidates, warned the Tories a no-deal exit would be "catastrophic", in a warning to rivals such as Esther McVey who are actively pursuing such an outcome.
Elsewhere, Speaker John Bercow fanned the flames by telling an audience in Washington that it would "inconceivable" for parliament to lack a voice over the shape of Brexit.
In another dramatic day in Westminster, the equality watchdog announced a formal investigation into antisemitism in Labour, while the Muslim Council of Britain demanded the Conservatives face a probe into claims of Islamophobia.
Tony Blair's former spin doctor Alistair Campbell was also expelled from Labour after admitting he voted for the Liberal Democrats in the European election
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The shadow home secretary told BBC Radio 4’s Today programme her party was now supporting a Final Say vote even on a deal that Labour has negotiated.
The party previously said it would only want a public vote on a Conservative deal or to avoid a no-deal exit.
But after a “disappointing set of results” in the European Parliament elections, Ms Abbot said: “What we’re saying is that we do want to have a People’s Vote on any deal, and I think that’s clear enough.”
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Senior figures including shadow chancellor John McDonnell, shadow foreign secretary Emily Thornberry and deputy leader Tom Watson have joined calls for a public vote.
It comes after an exodus of Remain voters consigned the party to its worst national election result since 1910, writes Andrew Woodcock.

The Tory leadership contender told BBC Radio 4’s Today programme: “I’m worried that if we don’t solve it [Brexit], we will face a political crisis that is far bigger actually than our legal relationship with the EU, it could lead to the destruction of our party system and the end of my own party.
“I’ve always believed we should keep no deal on the table, I’ve always thought that’s the best way of getting a good deal and I’ve always thought that ultimately our economy would find a way to flourish even with the shock of no deal, but the biggest risk to Brexit now is...a general election.”
He added: “We must not go back to the electorate asking for their mandate until we’ve delivered what we promised we would do last time, which is to deliver Brexit, it would be absolutely catastrophic for us as a party.”
Writing in The Daily Telegraph, the foreign secretary also claimed the Tories would be “annihilated” and “face extinction” if a general election were called before Brexit is delivered.
“Any candidate for prime minister whose strategy leads to a general election is offering a prospectus for disaster,” Mr Hunt wrote.
More on this from Tom Embury-Dennis:

People from the 27 EU nations who were resident in the UK at the time of the June 2016 referendum would be eligible for a British passport under the scheme.
Under Mr Gove’s plan, the EU nationals would not have to pay a £1,330 fee when eligible for naturalisation in 2021 because they resided in the United Kingdom when the referendum was held in June 2016.
The Surrey Heath MP is running to replace Theresa May as prime minister and Conservative Party leader in a crowded field of competitors which also includes Boris Johnson.



He said Labour leader Jeremy Corbyn “has got to come to a clear position”, telling Sky News: “The one that is very obvious is that both party leaderships have made the same mistake, which is to think that it’s possible to sit on the fence on Europe and appeal to both sides.
“What the European elections show you is that isn’t possible.”
Throwing his hat into the ring, the housing minister promised to bring “fresh new ideas” to the debate and said he was representing a “new and talented generation” of Tory MPs.
Mr Malthouse is best known for his role in bringing together Leave and Remain Tory MPs to draw up the so-called “Malthouse Compromise” in a bid to secure the House of Commons’ support for Ms May’s Brexit deal.
Our political correspondent Benjamin Kentish has more on this:


Mr Hunt told BBC Radio 4’s Today programme: “Well first of all I think Richard Ratcliffe is an incredibly brave man. I want to reassure him that there is no policy to keep these court hearings private.
“It is an arbitration procedure which is normally held in private unless someone applies for it to be made public and we're very happy for it to be made public.
“The reality is that Nazanin is an entirely innocent woman who is being held as a tool of diplomatic leverage by Iran and we don’t know exactly what it is they’re looking for, but the problem is if you pay ransom money to someone who is a hostage, then all that happens is you might get that hostage out, but the next time they want something, they'll just take someone else hostage, that is the conundrum you have.”
The international development secretary tweeted the clip of himself on Monday speaking to a member of the public in Barking, east London, alongside the comment “practising my now - rather rusty - Dari”.
Mr Stewart, seen by bookmakers as an outsider for the top job, lived in Afghanistan for several years as chairman of a human development organisation.
He has since been called upon as a political adviser on the country and presented a BBC documentary called Afghanistan: The Great Game.
“One of the better conversational Daris I’ve heard from expats,” wrote author and Afghanistan analyst Ahmad Shuja.
Former Conservative MEP Sajjad Karim tweeted: “This is what Britain needs in its leader today. I’m supporting Rory for leader of Conservatives because he has what it takes.”
Kabul-based journalist Thomas Watkins responded: “Sounds pretty good to me...”
A social media campaign to make Boris Johnson the next prime minister is being run by the owner of the notorious political website Guido Fawkes, it has been revealed.
A website called Boris2020.org is urging members of the public to get “Get Boris On The Ballot” – claiming there is a “plot” by pro-EU Conservative MPs to thwart him.
The adverts have provoked suspicion because they are similar to the online campaign, earlier this year, to pressure MPs to vote against Theresa May’s doomed deal.
Read the full story from our deputy political editor Rob Merrick:
British Sikh Neena Gill’s speech was loudly interrupted by angry supporters of Nigel Farage's Eurosceptic party during the declaration of results for the West Midlands in Birmingham on Sunday night.
West Midlands Labour said the heckles exposed an “ugly truth” about the Brexit Party – and Ms Gill sent out a message on social media characterising the incident as “racism”.
However, Brexit Party spokesmen said their supporters had been enraged by Ms Gill claiming in her speech that they were racists and fascists, and denied that the “go home” heckle had a racist intent.
More from our political editor Andrew Woodcock here:

Tony Blair’s former spin chief attacked the decision, contrasting the ruthless approach with “the way antisemitism cases have been handled”.
“I have been advised by lawyers with expertise in this field I have grounds for appeal against expulsion and shall do so,” Mr Campbell tweeted.


The Withdrawal Agreement Bill had been due to be published in the week beginning 3 June, according to plans set out before the prime minister announced her decision to step down as leader of the Conservative Party.
The prime minister’s official spokesman said: “We now have to reflect on the fact that we are in a different position.”
Britain’s largest Muslim organisation has called for a formal investigation into Islamophobia in the Conservative Party.
The Muslim Council of Britain (MCB) sent more than 20 pages of evidence to the Equality and Human Rights Commission, in the wake of the government’s refusal to adopt a proposed definition on Islamophobia.
Its complaint accused the Tories of “ignoring” calls for an independent inquiry on anti-Muslim hatred and failing to take action against Islamophobes in its ranks.
More here from our Home Affairs correspondent Lizzie Dearden:
Brexit minister James Cleverly is rumoured to be the 11th person to declare their candidacy to be Tory leader.
A flashy website has appeared under the banner "Let's All Win with James Cleverly", setting out his pitch - although it's important to note that this has not been officially confirmed.
Describing the 49-year-old former soldier as "the future leader of our party and our country", the site says that only Cleverly can make the Tories "electable".
"He can offer something new, by saying something new," said the site. "We believe that James can level the playing field in a country that has become too divided." There was no immediate confirmation from Mr Cleverly's office that he was preparing a bid."
After the European elections, Mr Cleverly tweeted:
