Sammy Wilson: Brexit legal advice will prove Theresa May is a liar

Theresa May will be exposed as a “liar” if the government releases its full legal advice on the Brexit withdrawal deal, DUP MP Sammy Wilson has declared.

In a huge challenge to Mrs May’s premiership, her erstwhile allies the DUP are set to join forces with Labour, Liberal Democrats and SNP MPs today in calling for Commons Speaker John Bercow to hold the government in contempt Parliament for its refusal to publish the legal opinion of the attorney general.

Prime Minister Theresa May is facing concerted calls to publish the government's legal advice on the Brexit Withdrawal Agreement

Prime Minister Theresa May is facing concerted calls to publish the government's legal advice on the Brexit Withdrawal Agreement

MPs across Parliament have angrily accused ministers of ignoring the will of the House after they said they would only release a “full reasoned political statement” on the legal position.

It follows a binding Commons vote last month requiring the government to lay before Parliament “any legal advice in full” – including that given by the attorney general – relating to the Withdrawal Agreement.

Speaking to the News Letter yesterday, DUP Brexit spokesperson Mr Wilson said: “The PM clearly doesn’t want the legal advice published because she knows it makes a liar of her.

“She has been going round saying that the backstop would only be a temporary arrangement, but the legal advice she has makes it clear that is not the case.

DUP MP Sammy Wilson said defeat in the Commons for Theresa May's deal is a foregone conclusion

DUP MP Sammy Wilson said defeat in the Commons for Theresa May's deal is a foregone conclusion

“It proves that she is selling the agreement on a false premise.”

The latest row erupted as it was reported the Attorney General Geoffrey Cox – who is due to make a statement to the Commons today – had warned the UK could be tied to the EU customs union “indefinitely” through the Northern Ireland “backstop”.

The Sunday Times said in a letter sent last month to Cabinet ministers, he advised the only way out of the backstop – designed to prevent the return of a hard border with the Republic – once it was invoked was to sign a new trade deal, a process which could take years.

“The protocol would endure indefinitely,” he is reported to have written.

Former Brexit secretary Dominic Raab, who quit last month over the Withdrawal Agreement, said the legal position was clear.

“The backstop will last indefinitely until it is superseded by the treaty setting out our future relationship, unless the EU allows us to exit,” he told The Sunday Times.

“The EU has a clear veto, even if the future negotiations stretch on for many years, or even if they break down and there is no realistic likelihood of us reaching agreement.”

Ministers have argued the legal advice is privileged, in the same way as any advice given by a lawyer to their client, and that government cannot function if it is required to release such confidential material.