An EU proposal for the Northern Ireland border threatens "constitutional integrity" (19659004) A draft law agreement published by the EU proposes a "common regulatory area" on the island of Ireland after Brexit if no solutions can be found.
Ms. May said: "No The British Prime Minister could" agree. "
The EU says the controversial" backstop "option should not" provoke "the UK.
EU negotiator Michel Barnier has presented the draft agreement
He said the text was "no surprise" and merely constituted a valid assessment of what had been agreed so far.
Mr Barnier said the document contained "concrete and realistic solutions" on the question of how to avoid a hard border to the UK leaves the EU Customs Union
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On the Prime Minister's questions, Ms. May said she would make her opposition to the "back up" option "crystal clear" to the European Commission.
"The draft The legal text published by the Commission, if implemented, would undermine the United Kingdom Common Market and endanger the constitutional integrity of the United Kingdom by creating a customs and regulatory border in the Irish Sea, rather than a British Prime Minister could ever agree with him. "
The Prime Minister responded to a question from David Simpson of the Democratic Unionist Party, which gives the government the lower house support it needs to win important votes in the lower house.
Earlier Westminster Leader of the DUP Nigel Dodds said his reaction to the release had been "astonished" that the EU meant "could either fly with us or the British government."
"We have not left the European Union to oversee the dissolution of the UK," he told the BBC, adding that it would be "disastrous" for Northern Ireland to be cut off from the UK markets.
Conservative Brexiters have also said it is "totally unacceptable" and would effectively annex Northern Ireland.  Even after Brexit, there is opposition to any role of the European Court of Justice – the EU proposes that disputes over the Brexit Agreement be settled in future years by a "joint committee" that can turn to the EU Court of Justice
According to the draft text, this would include "an area without internal frontiers in which the free movement of goods is ensured" and include customs, VAT, energy, agriculture, goods and other sectors.
The Irish Government said this option was "very biased and would only apply if it proved necessary".
Ireland's Foreign Minister Simon Coveney said the publication was "another important step in the Brexit negotiations"
Irish border issue by entering into a new customs union with the EU, ie controls are not required as people and goods between Northern Ireland and the Republic operate.
Shadow Brexit Secretary Sir Kier Starmer said: "The EU-British government war of words must stop.
" Of the solemn commitments that Northern Ireland made at the end of the first phase of the Brexit negotiations, absolutely none can Be speech. That means no hard limit or agreement that would undermine the Good Friday Agreement.
"Theresa May's failure to offer any viable solution to the Northern Ireland border hit her again."