London - British Prime Minister Theresa May will on Monday tell parliament how she plans to proceed with Brexit after MPs on Tuesday roundly rejected her proposed deal for the country's withdrawal from the European Union.

With fewer than 70 days to go until Brexit, scheduled to take place on March 29, May will share a plan B with MPs.

But some opposition politicians who met with May last week as she scrambled for cross-party consensus said the leader was in no mood to compromise.

The Green Party's Caroline Lucas told the BBC: "I asked her what she would be willing to potentially change and I got no answer.

"She's blackmailing MPs hoping to run down the clock by trying to force them to accept her deal because that's better than crashing out with no deal."

May's deal was defeated in parliament on January 15, with 432 MPs voting against it and just 202 for.

On January 16, May survived a confidence vote launched by the opposition.

On Monday, she is expected to discuss one of the central Brexit issues - the Irish backstop. British media reported late on Sunday that she might suggest dropping the safety net provision to appease critics.

Within the withdrawal agreement, the backstop prevents a hard border being erected between Northern Ireland, a constituent part of the United Kingdom, and the Republic of Ireland, an EU member state, if a trade deal hasn't been agreed between the EU and the UK by the end of the transition period.

Under the terms of the agreement, the whole of the UK will remain in a customs union in relation to trade in goods with the EU "unless and until" the bloc agrees there is no prospect of a return to a hard border.

There is still a huge amount of uncertainty, but this week will be an opportunity for MPs to start showing their colours. Maddy Thimont Jack, a researcher at the Institute for Government in London

Oliver Patel, research associate at the University College London European Institute, said: "I am not really holding my breath for much clarity on the direction of travel - there is no clear indication of a major change in policy by Theresa May, and legally it is quite ambiguous what the content of this statement has to be."

Her statement will fulfil obligations under the EU Withdrawal Act that require the prime minister to tell parliament what she would do after it rejected the deal she negotiated with Brussels.

In principle she does not have to be precise - but May is under huge political pressure to flesh out her strategy as MPs gear up to propose their own alternatives to her vision of Brexit.

Parliament will debate and vote on her tweaked proposal on January 29.

Political wrangling

May's comments on Monday will set the scene for wrangling that will determine the country's direction.

Maddy Thimont Jack, a researcher at the Institute for Government in London, said: "May's statement will influence what MPs decide to do when it comes to voting on those amendments on January 29. So the content of her statement is going to be important for influencing how MPs will vote.

"There is still a huge amount of uncertainty, but this week will be an opportunity for MPs to start showing their colours."

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British media has reported that several MPs were attempting to take control of Brexit.

One strategy being pursued by former Conservative minister Nick Boles would make it legally impossible for the UK to leave the EU without a deal - which some economists warn would be disastrous - to enable fresh talks with Brussels.

Another involving Labour's Yvette Cooper seeks to delay Brexit to allow for further negotiations with Europe.

And a plan backed by Conservative Dominic Grieve demands MPs are able to debate Brexit issues before they are set in stone.

The prime minister's priority is to build support for a revised version of her rejected deal, meaning she could adopt a delicate balancing act to appeal both to her own and opposition MPs - while maintaining the "red lines" she set for Brexit talks with the EU two years ago.

David Phinnemore, professor of European Politics at Queen's University Belfast, said: "Clearly her position, her red lines, the withdrawal agreement, and the political declaration on Britain's future relationship with the EU, only command the support of a third of MPs.

"So she has got to make some concessions to others - and she has got to look to the opposition."

Cross-party talks

Labour leader Jeremy Corbyn refused to meet May for talks last week, demanding she first ruled out any prospect of a "no deal" Brexit, saying: "With no deal on the table, the prime minister will enter into phoney talks just to run down the clock."

In a letter to Corbyn, May said this was an "impossible" precondition for participating in talks "because it is not within the government's power to rule out 'no deal'."

Phinnemore said it was essential for May to get Labour on board if she wished to make progress, but there were no signs yet that there had been "meaningful discussion".

"In some respects the PM and Corbyn are dancing around each other. He is playing to get a general election, but is obviously in a difficult position himself because he is being very insistent on wanting to ensure that a 'no deal' Brexit is taken off the table before any discussion takes place.

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"But he wants to make this as painful as possible for the prime minister before he budges."

Professor Anand Menon, director of the The UK in a Changing Europe academic think-tank, said that May's refusal to compromise on her own "red lines" made cross-party consultation meaningless.

He said: "What the prime minister specialises in doing is taking options off the table. That's fine if you have got a majority of 150, but at this stage it's just a bit thick."

Patel agreed, questioning why May had refused so rigidly to consider compromising on "second-tier" issues.

"The fact that they are not willing to move on things like staying in a customs union with the EU suggests to me that these aren't really proper cross-party talks," he said.

What next?

While Monday's statement could spawn a flurry of debates and procedural tactics to change the direction of travel on Brexit, senior parliamentarians want the government to call a formal series of "indicative votes" on options facing the country.

These would determine how much support there was for potential outcomes - including a modified version of May's deal, no deal, or even a second referendum that could halt Brexit entirely - as well as other alternatives.

It remained to be seen whether or when May would return to parliament with concessions from the EU that made her own deal more palatable to MPs.

"She is not going to get anything because the EU don't want to waste political capital on her as they don't think she can get a revised deal through parliament," said Menon.

However, Phinnemore added that the EU could move on the political declaration outlining the terms of Britain's future relationship.

"Where the EU has definitely signalled there is space to make concessions or to change the language is in the political declaration on the future relationship - and that now seems to be the focus of discussions between May and opposition parties."