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He used the meeting to tell the diplomat of his intention to reject any deal that fails six tests set by his party.

But Brexit campaigners attacked his intervention as a fresh attempt to undermine the country’s negotiating position in his drive to bring down Theresa May’s Government.

Former Ukip leader Nigel Farage, a leading figure in the Leave Means Leave campaign, said the meeting “was clearly an attempt to undermine negotiations after he promised to vote down May’s deal”, adding: “He is obviously believed by the European Commission to be a useful idiot. But I’m sure workingclass people who voted Leave will feel betrayed and angry at his ill thought-out strategy to betray British interests.”

Tory MP Ben Bradley added: “We’ve see this week that Corbyn and Labour want us to continue to take EU rules and pay in through a customs union, or even hold a new vote if they can get away with it.