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Labour Party chairman Ian Lavery said: "This is absolute chaos and Theresa May has no authority left." "The Prime Minister is in office but not in power. She cannot deliver Brexit and our country is at a complete standstill, while the Tories indulge in their leadership tussling. "We can't go on like this. Britain needs a functioning government." The Prime Minister is hoping to win over Tory Brexiteers after a backlash against her plans for leaving the bitter bloc.

But Mr Davis, who signed up to the plan agreed by the Cabinet after marathon talks at Chequers on Friday, has now quit. Labour MP Mary Creagh wrote on Twitter: "David Davis doesn't even give May the courtesy of resigning during the day. "Leadership contest imminent..." She added: "Johnson & Grayling only 2 Leavers who have not backed May publicly this w/end. Tick tock." Shadow foreign secretary Emily Thornberry tweeted a list of Tory resignations since November last year. She said: "There have been six resignations in 249 days. "That's one every six weeks."

Chequers summit in pictures: Theresa May's big Brexit meeting Fri, July 6, 2018 The Prime Minister gathered her cabinet together ahead of a crunch Brexit showdown at her country retreat at Chequers in Buckinghamshire Play slideshow PA 1 of 14 Members of the cabinet and government officials gather at Chequers

While Labour leader Jeremy Corbyn tweeted: "David Davis resigning at such a crucial time shows Theresa May has no authority left and is incapable of delivering Brexit. "With her Government in chaos, if she clings on, it's clear she's more interested in hanging on for her own sake than serving the people of our country."

The Prime Minister is hoping to win over Tory Brexiteers

David Davis's departure may now encourage backbench Brexiteers with concerns about Mrs May's leadership. The move comes just a day before a major test for Theresa May as she faces the House of Commons and then a meeting with Tory MPs and peers on Monday. Mrs May is expected to tell MPs that the strategy agreed on at Chequers is the "right Brexit" for the UK