Asked if that stance would put her on the “same side as Jeremy Corbyn”, Ms Thornberry replied: “Yeah. Of course.

“If there’s a choice between a disastrous Tory Brexit or no deal and Remaining, then that is what we will have to do.”

Labour’s 2017 manifesto says the party “accepts the referendum result” and will fight for “a Brexit deal that delivers for all regions and nations of the UK”.