THERESA May is to hold a private summit with key ministers to thrash out the details of her proposed new "bold offer" to MPs in a fourth and final attempt to get her Brexit deal through Parliament.

Tomorrow, the Prime Minister will present the final “improved” package of measures at the weekly meeting of the Cabinet, which is expected to sign off on a package of measures to be included in the forthcoming Withdrawal Agreement Bill[WAB] aimed at winning cross-party support.

However, there was widespread scepticism at Westminster that it will fare any better than her three previous failed attempts to get the Commons to pass the deal.

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Following the collapse last week of cross-party talks with Labour aimed at reaching a common approach, Jeremy Corbyn said he had not yet seen anything new that would persuade him to support it.

It comes at the start of what looks likely to be another torrid week for Mrs May with the Conservatives braced for a hammering at the hands of Nigel Farage's Brexit Party in the European elections on Thursday. The results are due on Sunday.

One weekend poll put the Tories in a humiliating fifth place behind the Greens with the results likely to exacerbate frustration in the party at the failure to leave the EU in March as planned.

Labour - which has been criticised for facing both ways on a second referendum - is also expecting a difficult result with the same poll showing them in third place behind the Liberal Democrats.

A Government source said the WAB - which is needed to ratify the deal with Brussels - would include new measures on protecting workers' rights, an issue where agreement with Labour was said to have been close.

However, the source made clear the package would not just be aimed at Labour MPs but would seek to secure the widest possible support across the Commons.

It is expected to include provisions on future trade arrangements with the EU, on environmental protections, and on Northern Ireland, including the use of technology to avoid the need for border controls with the Republic.

Ministers will also consider whether to put any of the alternative approaches to indicative votes in the Commons to establish which, if any, can command a majority. But it is said that the PM has “gone cold” on the idea.

The Government will not, however, seek to re-open the Withdrawal Agreement - which included the controversial Northern Ireland "backstop" - after the EU repeatedly made clear it could not be re-negotiated.

Mrs May has said she will bring the WAB before MPs for its second reading vote in the first week of June following the short Whitsun recess.

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Regardless of how the vote goes, she will then meet the chairman of the Tory backbench 1922 Committee, Sir Graham Brady, to agree a timetable to elect her successor as party leader, paving the way for her departure from No 10.

The PM is expected to set out details of her WAB proposals in a major speech before the end of the month.

Downing Street said Mrs May was expected to talk to ministers in advance of Tuesday's Cabinet meeting but could not confirm when the WAB would be published.

"We have been working on that piece of legislation for a long time so the vast bulk of the work is completed but there is still work ongoing," the PM’s spokesman told reporters.

Asked how the WAB would be different to the deal previously voted on, he said: "Ministers have set out that they had good discussions with the Opposition in relation to areas such as workers' rights and environmental protections."

It is thought the date of the WAB publication rests on when the debate and vote will take place. If the debate and vote were to take place on the Tuesday when MPs return, then it will be published at the end of this week; if the debate and vote were to take place say on the Friday of the first week back, then it could be published on that preceding Tuesday.