David Davis, the Brexit secretary of state and arguably the most important minister in this government other than the Prime Minister, faces a moment of truth tomorrow. He is completely clear that it would be a disastrous mistake for the Prime Minister and the UK government to offer Brussels a backstop proposal for keeping the Irish border open that does not contain a specified end date.
His reason is simple. That backstop would commit the UK to staying in the customs union and single market. And once the EU were to have that commitment, Davis believes – plausibly – that his Brussels interlocutor Michel Barnier would no longer have any incentive to negotiate seriously on alternative arrangements for keeping the border open.
Davis would have zero leverage in those talks to obtain technical or fiscal solutions to the border issue.

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