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The European Research Group’s (ERG) legal panel, set up to analyse the revised deal, said the prime minister’s updated exit plan did not meet the government’s own tests.

It means the deal is highly likely to be rejected when MPs vote on it tonight, dealing what could be a fatal blow to May’s withdrawal agreement.

The news follows the legal advice by the Attorney General who claimed that the “legal risks” of the UK being stuck in the backstop, remain unchanged.

Earlier a senior Tory MP then urged Theresa May to call a general election if she loses tonight’s vote.

Charles Walker said Mrs May “has to get a new mandate for the sake of the country.”

“We cannot go on trying to govern like this,” Mr Walker, the vice chairman of the influential 1922 committee of backbench MPs, said. “If [the deal] doesn’t go through as sure as night follows day there will be a General Election within a matter of days or weeks. It is not sustainable.”

Via Independent / The Telegraph