The UK Parliament ordered the government to reveal the advice, and the government complied after it lost a crucial vote in the Commons on Tuesday, in what was called a political humiliation for Prime Minister Theresa May.
And he said that - despite assurances from both London and Brussels that it is meant to be temporary - the protocol would "endure indefinitely" under global law until another agreement takes its place.
"Domestic legislative tinkering won't cut it", she wrote on Twitter.
"On Monday the Attorney General told MPs that it would be "contrary to the national interest" to release his legal advice of November 13", said Ms Lucas.
The advice, which is only six pages long, is being avidly read by MPs in the House of Commons in real time, suggests that because of the nature of the Irish backstop arrangement in the Brexit deal, the United Kingdom could be trapped in "protracted and repeated rounds of negotiations" for years ahead.
Blair repeated his claim to reporters that Brexit will be economically damaging - something backed up by the government's own assessment and that of the Bank of England - and said May should have been more transparent about trade-offs when she set out to negotiate with Brussels.
Under the Withdrawal Agreement, the backstop would be introduced if a trade deal had not been agreed by both sides by the time the transition period ends in December 2020. It was the first time in British parliamentary history the government has been found in contempt by MPs.
The PM's deal is now supported by only 27 per cent of Brits putting her offer level with a no deal agreement (even though a no deal has a lead support in 30 seats).
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Still, she said she got by with falsified documents and a knack for cleaning according to Trump's highly specific standards. The Trump Organization did not immediately respond to a request for comment, nor did the lawyer representing Morales.
May has repeatedly said that if lawmakers reject her deal with Brussels, which would see Britain exit the European Union on March 29 with continued close ties, the only alternatives are leaving without a deal or reversing Brexit.
Meanwhile, ITV confirmed last night it had scrapped plans for a televised debate between Mrs May and Labour leader Jeremy Corbyn on Sunday.
About 90 Conservatives are, at the moment, expected to rebel when MPs vote on the deal next Tuesday.
Sir Graham told BBC Two's Newsnight: "I think the most important thing is to have clarity about how we might remove ourselves from a backstop ... if we were to enter into one in the future". 'If that question can be answered in the next few days then all well and good.
"If we get to the point where it might be needed, we have a choice as to what we do, so we don't even have to go into the backstop at that point".
"We believe ours was a fair and appropriate format for those taking part and, crucially, for our audiences around the country, and it is a shame we will not be able to bring them this programme", the BBC said in a statement.
Speaking recently, he said: "I'm absolutely diametrically opposed to it and I'm assured by a very large number of colleagues that they hold a similar opinion".
Prime Minister Theresa May leaving 10 Downing Street, London for the the House of Commons ahead of a five-day debate on her draft Brexit bill.