Mr Johnson, who resigned his position in the Whips' Office a short while ago, said the decision was hardest he had "ever made".

The MP for Dartford - who backed Leave in the referendum - said he had been "hopeful that changes could be made to improve the deal with the European Union but it is now clear to me that no significant changes will be made".

"The 'back stop', contained in the agreement, gives our country no clear, unilateral path out of the European Union and ensures we will be fettered in our ability to negotiate trade deals with other nations in the future," he added.

"Along with near, two thirds of my constituents and a majority of the country, I supported 'leave' in the referendum as I wanted the UK to take back the sovereignty we had lost during our membership of the European Union.

"Unfortunately, this agreement prevents us taking back control and instead could leave us perpetual, constrained by the European Union."

Image source, UK Parliament

Image source, EPA

The prime minister rewrote part of her speech about Brexit following criticism it was factually inaccurate.

Theresa May had planned to say that both sides had accepted the result of the Welsh assembly referendum in 1997.

But she had voted against the creation of the institution following the devolution referendum.

Labour and Plaid Cymru politicians accused her of hypocrisy - and the line, which had been given to journalists ahead of the speech, was dropped.

Instead, she said the result was accepted by parliament.

Read more here.

Conservative MP Gareth Johnson has resigned from his position as a a minister in the Whips' Office.

In a letter to the prime minister, he said: "Over the last few weeks, I have tried to reconcile my duties as a Whip to assist the government to implement the European withdrawal agreement with my own personal objections to the agreement.

"I have concluded that I cannot, in all conscience, support the government's position when it is clear this deal would be detrimental to our nation's interests."

"Sterling will remain extremely sensitive to Brexit news over the next 48 hours," according to Neil Wilson of markets.com.

Following Mrs May's speech this morning, the pound has risen slightly against the Euro.

The Confederation of Paper Industries says it is concerned about the potential for delays if the UK does not achieve a trade deal over over Brexit:

Environment Secretary Michael Gove, when asked whether the vote on Tuesday could be the biggest defeat suffered by a government in modern British history, said he is "not a fortune teller or astrologer", so he does not know.

He told the Press Association: "What I can do is try to convince my colleagues to vote for the deal, because if we don't vote for the prime minister's approach then we risk either having no Brexit - which would dishonour the mandate, the instructions that we were given by the British people - or we risk leaving without a deal.

"While, of course, Britain would recover over time if we left without a deal, it is clear there would be economic damage in the short term."

Image source, PA

In further comments to BBC News, Tory rebel Dominic Grieve warns: "The awful truth is that we are not at the end of a process we are at the start of a process...in six months' or twelve months' time the electorate is going to turn around and say 'we never wanted anything like this'."

He claims it is "not undemocratic" to go back to the people, adding: "I think a second referendum provides a way out of this because it actually goes back to the public and asks them what they want."

Tory rebel Dominic Grieve tells BBC News: "There's a majority in the House of Commons that, for differing reasons, simply feel that this deal is a bad one."

Mr Grieve says for leavers, Mrs May's deal "doesn't correspond in any way with your dreams" and is "very far removed" from them.

He says for those like him, who "believe we've made a mistake" and are "objectively much better off staying in", that "this is a third-rate future for our country, if we leave on these terms".

Tulip Siddiq has postponed the date of her planned caesarean section by two days - so she can vote against Theresa May's Brexit deal.

The MP for Hampstead & Kilburn will be taken through the Commons lobby in a wheelchair by her husband, the Evening Standard reports.

As the Daily Mirror political editor comments, that's commitment.

Cardiff City FC have distanced themselves from manager Neil Warnock's pro-Brexit remarks after Saturday's Premier League game against Huddersfield by saying his views do not represent that of the club.

Warnock launched an attack on the government's failure to deliver on the 2016 referendum result, saying he could not wait to be out of Europe and added the parting shot: "To hell with the rest of the world."

Cardiff issued a club statement on Monday, saying: "Comments made by our manager following Saturday's fixture are representative of his personal political stance.

"These comments do not reflect the political position of Cardiff City Football Club, nor its board of directors. Cardiff City FC will be making no further comment on the matter."

Cardiff are owned by Malaysian businessman Vincent Tan and have players from Africa, Asia, continental Europe and North America.

During her speech, Mrs May also offered an olive branch to Labour MPs who might consider backing her deal with an appeal over workers' rights and environmental standards.

She said: "I could not have been clearer that far from wanting to see a reduction in our standards in these areas, the UK will instead continue to be a world leader.

"We have committed to addressing these concerns and will work with MPs from across the house on how best to implement them, looking at legislation where necessary to deliver the best possible results for workers across the UK."

Image source, PA

Health Secretary Matt Hancock told PA he hopes that the government wins the vote on Tuesday.

Pressed on whether that is possible, he added: "Yes, of course it is possible," as Mr Hancock agreed it would be a major political win for the PM if she does.

"I think that we should do everything we can to persuade people that this is the best deal, it is the best way to deliver Brexit, and then we can get on and deliver on so many other important issues," he added.

Asked by how many votes Mrs May could win by, Mr Hancock said he is "not going to get into that", and added: "I am not here to commentate, I am here to say what is right for the country, and what is right for the country is voting for the prime minister's deal."

As his aides brought the short interview to an end, pressed on if Article 50 is going to be delayed, Mr Hancock said no.

Image source, PA

Here's a bit more from the PM's speech.

She said the letter from the EU contained "valuable new clarifications and assurances to put before the House of Commons, including on getting our future relationship in place rapidly so the backstop should never need to be used".

She added: "We now have a commitment from the EU that work on our new relationship can begin as soon as possible after the signing of the withdrawal agreement in advance of March 29, and we have an explicit commitment that this new relationship does not need to replicate the backstop in any respect whatsoever."

Asked if she believes she can get the vote through tomorrow, Mrs May said she was working to ensure that happens - but didn't say how likely that actually is.

She's now finished answering questions at the Stoke factory.