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Letters are being lodged with Graham Brady, Chairman of the influential 1922 Committee, ahead of a Tory Party showdown on Monday.

The fallout comes amid mounting fury from disgruntled Conservative backbenchers following publication of Mrs May’s 12-point Brexit manifesto.

Leave MPs are furious at what they see as Mrs May’s caving in to demands from the Remain wing of the party to steer Britain towards a soft Brexit.

On Sunday, ITV's Robert Peston tweeted: "Sources confirm letter calling for vote of confidence in @theresa_may leadership going in to @Graham_Brady, chair of 1922.