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Theresa May has been branded 'dishonest' and 'pathetic' by her own resigning ministers as she faces a new showdown over Brexit .

The Prime Minister faces her next big Commons vote tomorrow night on the Customs Bill after her new 'soft' Brexit plan from Chequers triggered a Tory meltdown.

Brexiteer ringleader Jacob Rees Mogg has launched a bid to defeat the government on the Bill to ensure Hard Brexit. Meanwhile Remainers could also vote against Mrs May - the other way, to ensure Britain stays in a full customs union.

Ahead of the split, Mrs May said she could “understand concerns” about her plans to ensure a "common rulebook" on goods between the UK and the EU. But she warned without it, we would be “breaking up" the "precious" union.

Facing down leadership rebels by insisting she's "in it for the long term", she added: "We need to keep our eyes on the prize. If we don’t, we risk ending up with no Brexit at all."

(Image: Getty Images Europe)

Speaking on the BBC's Andrew Marr Show today, the Prime Minister admitted the rulebook was a "compromise' that had "been in gestation for some time."

She insisted "no department was cut out of these discussions" and added: “I am yet to see a workable alternative."

But this final claim was branded a lie by David Davis, who resigned as Brexit Secretary last week.

He told the Sunday Times: “Some are saying that those on the other side have not worked out an alternative."

"This is an astonishingly dishonest claim.”

(Image: AFP)

Mrs May admitted she had come up with the new plan because her previous ideas had been rejected as "unnegotiable" by the EU's chief negotiator Michel Barnier.

She told the BBC: "David Davis was discussing with Michel Barnier. Michel Bernier had made clear to him the unnegotiability of the position we had, so we had a choice.

“We could have said we’ll stick where we are and see what happens and risk actually ending up with a chaotic leaving, which I don’t think is in people’s interest.

“Or we could have said: ‘OK let’s look at moving forward, let’s look at an alternative proposal’, which we have put forward."

(Image: AFP)

Mrs May insisted her plan wouldn't rule out trade with the US, saying: "It does allow us to do new trade deals around the rest of the world."

But she admitted she was open to Donald Trump's demand for a "carve out" - special rules for the US - in a bid to secure UK-US trade.

She was confronted by BBC host Andrew Marr with her own formal White Paper, which says her plan will "limit" the ability to change regulations.

She insisted: "Some of these are regulatory standards that we wouldn’t want to change anyway."

(Image: REUTERS)

Steve Baker, who also quit as a Brexit minister, retweeted a message saying "May must go" last night.

He accused her of presiding over a "cloak and dagger" plot that left Britain in a "pathetic" bargaining position with the EU.

Specifically he accused the Prime Minister's Europe Unit, based out of the Cabinet office, of mounting a "coup" to wrest control of the Brexit negotiations from the Brexit Department.

And he warned the Chequers Brexit plan would lead to "political disaster".

(Image: Dan Kitwood)

"I think that if we spoil and wreck Brexit, which Chequers does, then we will get Jeremy Corbyn . That would be a cataclysm" he told the Sunday Telegraph.

"The public will know they've been betrayed. Well then what will happen to trust? Trust, I think, in democracy at that point will be blown apart."

Cabinet ministers Esther McVey and Penny Mordaunt are still considering resigning, according to the Sunday Times.

Even arch-remainer Lord Mandelson said Mrs May’s plan is the “polar opposite of taking back control” that would lead to “national humiliation”.

It comes after Donald Trump insisted the Chequers deal COULD allow Britain to have a trade deal with the US - after previously saying it would "kill" it.

But in return the President demanded a "carve out" - in other words, special rules for the US that don't apply when the UK deals with other countries.

Mrs May today admitted there could be such a "carve out", saying: "Carve outs are things that are done in trade deals around the world."

She said other countries would want to discuss one too, saying: "We’ll discuss with them in our terms”.

(Image: PA)

Labour Party chairman Ian Lavery said: "No one - not the public, Parliament or the Conservative party - is happy with Theresa May's offer. This has descended into a shambles."

Deputy Labour leader Tom Watson warned Mrs May’s Brexit plan is currently “not good enough” for Labour to back it this October.

He said Labour had "very little confidence” in her ability to deliver and would not rule out backing a second referendum.

Of the so-called ‘People’s Vote’ he said: “It seems to me that to take that off the table completely when there might be a set of circumstances where parliament cannot deliver a meaningful vote, would be a mistake, but we don't want that."