Transport minister Jo Johnson has resigned over Brexit, saying the deal being finalised "will be a terrible mistake".

The MP, who is Boris Johnson's brother, has backed calls for a People's Vote.

In a statement announcing his resignation, he said: "We are barrelling towards an incoherent Brexit that is going to leave us trapped in a subordinate relationship to the EU."

He added that it is "imperative" to "go back to the people and check they are content to proceed on this extraordinary basis".

He added: "Britain stands on the brink of the greatest crisis since the Second World War ... I reject this false choice between the PM’s deal and “no deal” chaos.

"On this most crucial of questions, I believe it is entirely right to go back to the people and ask them to confirm their decision to leave the EU and, if they choose to do that, to give them the final say on whether we leave with the Prime Minister’s deal or without it."

A spokesperson for Theresa May said: "The referendum in 2016 was the biggest democratic exercise in this country's history. We will not under any circumstances have a second referendum.

"The Prime Minister thanks Jo Johnson for his work in government."

Mr Johnson’s resignation came hours after David Lidington said he was confident that MPs would back the government’s deal once it was published.

Read more: Boris Johnson: Theresa May's Chequers Plan would turn UK into 'EU colony'

Theresa May is hoping to secure the support of her ministers at a cabinet meeting next week, and to strike a final deal with Brussels within weeks.

While Boris Johnson was a leading Brexiteer, Jo voted to remain in the EU.

Boris praised his sibling's decision, saying: "Boundless admiration as ever for my brother Jo. We may not have agreed about brexit but we are united in dismay at the intellectually and politically indefensible of the UK position.

"This is not taking back control. It is a surrender of control. It does not remotely correspond to the mandate of the people in June 2016."

Boris himself stood down as foreign secretary after objecting to the Prime Minister's Chequers plan.