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Brexiteer MPs Boris Johnson and Jacob Rees-Mogg have said they will vote down Theresa May’s divorce deal after negotiators reached an agreement in Brussels.

A government source confirmed a Brexit agreement was reached between the UK and EU at a "technical level" today.

The prime minister will attempt to win over her cabinet in a meeting tomorrow before a "meaningful" vote in the House of Commons.

Former foreign secretary Mr Johnson said he would vote against the deal, claiming it was "vassal state stuff", and urged the cabinet to "chuck it out".

He said he expected the deal to be "pretty much" what had been agreed a few weeks ago.

"We are going to stay in the customs union on this deal, we are going to stay effectively in large parts of the single market and that means it's vassal state stuff," he told the BBC.

He added: "For the first time in a thousand years, this place, this parliament, will not have a say over the laws that govern this country. It is a quite incredible state of affairs."

Mr Johnson continued: "For the first time since partition, Dublin - under these proposals - would have more say in some aspects of the government of Northern Ireland than London.

"I don't see how you can support it from a democratic point of view, I don't see how unionists can support it, and I don't see how you can support it if you believe in the economic and political freedom of this country."

He claimed the deal was "making a nonsense of Brexit so I hope the cabinet will do the right thing and I hope they chuck it out".

Brexit: Article 50 Triggered - In pictures 20 show all Brexit: Article 50 Triggered - In pictures 1/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 2/20 Prime Minister Theresa May speaks during Prime Minister's Questions in the House of Common PA 3/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 4/20 5/20 6/20 7/20 European Council President Donald Tusk holds a news conference after receiving British Prime Minister Theresa May's Brexit letter in notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 8/20 Prime Minister Theresa May takes her seat after announcing in the House of Commons PA 9/20 The time 12:20pm shows on Big Ben on March 29, 2017 in London, England. The British Prime Minister Theresa May addresses the Houses of Parliament as Article 50 is triggered and the process that will take the United Kingdom out of the European Union begins Carl Court/Getty Images 10/20 D-day: pro-EU protesters outside of the Houses of Parliament today as Theresa May prepares to trigger Article 50 AFP/Getty Images 11/20 EU Council President Donald Tusk holds British Prime Minister Theresa May's Brexit letter which was delivered by Britain's permanent representative to the European Union Tim Barrow (not pictured) that gives notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty in Brussels, Belgium Yves Herman/Reuters 12/20 PMQ's in The House of Commons PA 13/20 Jeremy Corbyn speaking at PMQ's in The House of Commons Sky News 14/20 Theresa May leaving for the House of Commons Jeremy Selwyn 15/20 Mayor of London Sadiq Khan at the headquarters of Vivendi in Paris where he took part in TV interviews to discuss the imminent triggering of Article 50 by the UK to leave the EU Stefan Rousseau/PA 16/20 Britain's permanent representative to the European Union Tim Barrow arrives at the EU Council headquarters for as meeting before hand delivering British Prime Minister Theresa May's notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 17/20 Britain's ambassador to the EU Tim Barrow arrives at the British representation of the European Union in Brussels Aurore Belot/AFP/Getty Images 18/20 A giant headed Theresa May in Parliament Square, London during a protest by Avaaz after PM signed a letter to trigger Article 50 that starts the formal exit process by the UK from the European Union David Mirzoeff/PA 19/20 British Foreign Secretary Boris Johnson walks down Whitehall Jack Taylor/Getty Images 20/20 Britain's PM Theresa May signs the official letter to European Council President Donald Tusk, invoking Article 50. AFP/Getty Images 1/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 2/20 Prime Minister Theresa May speaks during Prime Minister's Questions in the House of Common PA 3/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 4/20 5/20 6/20 7/20 European Council President Donald Tusk holds a news conference after receiving British Prime Minister Theresa May's Brexit letter in notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 8/20 Prime Minister Theresa May takes her seat after announcing in the House of Commons PA 9/20 The time 12:20pm shows on Big Ben on March 29, 2017 in London, England. The British Prime Minister Theresa May addresses the Houses of Parliament as Article 50 is triggered and the process that will take the United Kingdom out of the European Union begins Carl Court/Getty Images 10/20 D-day: pro-EU protesters outside of the Houses of Parliament today as Theresa May prepares to trigger Article 50 AFP/Getty Images 11/20 EU Council President Donald Tusk holds British Prime Minister Theresa May's Brexit letter which was delivered by Britain's permanent representative to the European Union Tim Barrow (not pictured) that gives notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty in Brussels, Belgium Yves Herman/Reuters 12/20 PMQ's in The House of Commons PA 13/20 Jeremy Corbyn speaking at PMQ's in The House of Commons Sky News 14/20 Theresa May leaving for the House of Commons Jeremy Selwyn 15/20 Mayor of London Sadiq Khan at the headquarters of Vivendi in Paris where he took part in TV interviews to discuss the imminent triggering of Article 50 by the UK to leave the EU Stefan Rousseau/PA 16/20 Britain's permanent representative to the European Union Tim Barrow arrives at the EU Council headquarters for as meeting before hand delivering British Prime Minister Theresa May's notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 17/20 Britain's ambassador to the EU Tim Barrow arrives at the British representation of the European Union in Brussels Aurore Belot/AFP/Getty Images 18/20 A giant headed Theresa May in Parliament Square, London during a protest by Avaaz after PM signed a letter to trigger Article 50 that starts the formal exit process by the UK from the European Union David Mirzoeff/PA 19/20 British Foreign Secretary Boris Johnson walks down Whitehall Jack Taylor/Getty Images 20/20 Britain's PM Theresa May signs the official letter to European Council President Donald Tusk, invoking Article 50. AFP/Getty Images

Jacob Rees-Mogg, the leader of the pro-Brexit European Research Group of Tory MPs, said the reported deal represented a betrayal of Mrs May's promise to maintain the integrity of the UK.

"White flags have gone up all over Whitehall. It is a betrayal of the Union," he told the BBC.

"If what we have heard is true, this fails to meet the Conservative Party manifesto and it fails to meet many of the commitments that the prime minister makes.

"It would keep us in the customs union and de facto the single market. This is the vassal state.

"It is a failure of the government's negotiating position, it is a failure to deliver on Brexit and it is potentially dividing up the United Kingdom.

"It is very hard to see any reason why the cabinet should support Northern Ireland being ruled from Dublin."

Meanwhile DUP Brexit spokesman Sammy Wilson - whose party props up the government in the Commons - warned the prime minister she must honour the promises she had made to maintain the integrity of the the Union.

"These are promises which she made because she recognised that the integrity of the United Kingdom was important. She has made them time and time in the House and to us privately and to the public," he told the BBC.