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The “grown-ups” must be brought in to help Theresa May with Brexit, Rachel Johnson said today.

The journalist and broadcaster, who is backing the Liberal Democrats, said she wants to see Nick Clegg, Ken Clarke and Tony Blair involved in Brexit discussions as well as her brother, Foreign Secretary Boris Johnson.

Campaigning in the Lib Dem target seat of Vauxhall with candidate George Turner, she told the Standard: “What Theresa May is saying is we could go off a cliff, but we’re still going to do this because the people have decided this.

“Don’t we want some grown-ups in the room just saying ‘can we have a pause and actually decide calmly, without having the far-right of the Tories harrying us, and calmly decide what’s best for the country?’”

Ms Johnson’s decision to join the Lib Dems is a political split from her family’s Conservative heritage.

Her father Stanley was a Tory MEP and brother Jo is universities minister.

She said Mrs May’s only conviction is to stay Prime Minister, and she has not given out a strong message on Brexit, adding: “The reason we are having this election is so she can close down any dissent within the Tory Party... her opacity on Brexit is a problem because I don’t think either Leavers or Remainers have any sense of where her real instinct is on this question, because she was a shy Remainer.”

Ms Johnson described Croatia-born candidate Mr Turner as an example of “multi-cultural London”. He said it would not be fair for pro-Brexit Labour candidate Kate Hoey to represent the area, which “had the highest Remain result.”