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Theresa May has been warned her government will "collapse" if she does not abandon plans for a post-Brexit customs partnership with the EU.

Sixty eurosceptic Tory MPs from the European Research Group, led by Jacob Rees-Mogg, have sent the Prime Minister a 30 page report detailing their opposition to the plan.

Number 10 have been directly warned in correspondence that accepting a customs partnership will lead to a "collapse" of the government because it would mean Mrs May cannot deliver a clean break from the EU and would lose the support of Brexiteers.

Sources have told the Telegraph that the Tory MPs will consider withdrawing support for Government Bills in Parliament, which would lead to legislative paralysis and put Mrs May’s future as leader in doubt.

The threat of rebellion grew when David Davis wrote to Mrs May in recent days arguing “strongly” against the idea.