The former cabinet minister and Boris Johnson loyalist resigned her Commons seat of Mid Bedfordshire on Saturday, accusing the prime minister of betraying Conservative principles and telling him: "History will not judge you kindly."
Her resignation means the Tories face another challenging contest this autumn in what should be an ultrasafe seat. If Labour can overturn the 24,664 majority, it would represent the largest collapse in support for the Conservatives in byelection history.
The explosive manner of Dorries' departure has angered soon-to-be former colleagues, with the senior Tory MP Tobias Ellwood describing it as an "undignified chapter" and "an episode of colleagues throwing their teddies in the corner, in this case for simply not getting a peerage".
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