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Input: Battling a sore throat after late night talks with the EU, the prime minister urged MPs to vote for her "improved deal" or risk "no Brexit at all". But some leading Tory Brexiteers and the DUP, who keep her government in power, have rejected the deal. They say the legal assurances secured by the PM are not enough to prevent the UK being tied permanently to the EU. Sir Bill Cash, a leading Brexiteer, said: "In the light of our own legal analysis and others we do not recommend accepting the government's motion today." Sir Bill was part of a panel of legally-trained Brexiteer MPs who examined the PM's revised deal, concluding that it did not deliver the binding changes MPs had demanded. Another Brexit-supporting Tory, Jacob Rees-Mogg, said he had not yet decided which way to vote. Conservative MP Simon Clarke, leaving a meeting of Mr Rees-Mogg's European Research Group, said a "majority" of the group would vote against the deal. The DUP said in a statement that "sufficient progress has not been achieved at this time". Commons Speaker John Bercow did not select any of the amendments to the government motion that had been tabled by MPs. With husband Philip watching from the public gallery, Mrs May made a final plea to MPs to "come together" and "prove beyond all doubt that democracy comes before party, faction or personal ambition". "This is the moment and this is the time," she said. "Back this motion and get the deal done, because only then can we get on with what we came here to do - what we were sent here to do. "We cannot serve our country by overturning a democratic decision of the British people." The UK is due to leave the EU on 29 March. MPs voted overwhelmingly to reject the PM's deal on 15 January by 432 votes to 202. Labour leader Jeremy Corbyn said that "after three months of running down the clock" the prime minister had "achieved not a single change to the withdrawal agreement". He said it was the same "bad deal" MPs had rejected in January and Labour would be voting against it again because it "risks people's living standards", jobs and the NHS. Another dreadful day for No 10 As things stand the number of switchers seems far less than required to avoid another defeat for the prime minister. Last time out she was beaten by a record 230 votes. One cabinet minister guessed the number tonight might be around 150. Everyone is guessing still. But this looks like another dreadful day for Number 10, and another moment when doubts will be on display about not just the divorce deal with the EU, but about the prime minister's leadership too. Something has changed yes, but not enough. Read more from Laura here. Charles Walker, vice chairman of the 1922 Committee of backbench Tory MPs, said defeat for the government in the vote later would lead to a general election. He told BBC Radio 4's World At One: "If it doesn't go through tonight, as sure as night follows day, there will be a general election within a matter of days or weeks. "It is not sustainable, the current situation in Parliament." He added: "She will lead us into that general election. We haven't got time for a leadership election." Downing Street said: "We are not preparing for and we do not want a general election." Attorney General's legal advice It comes after Attorney General Geoffrey Cox told MPs the legal risk of being tied to the EU after Brexit "remains unchanged". He added that the new assurances secured by the PM did "reduce the risk that the United Kingdom could be indefinitely and involuntarily detained" in the Irish backstop if talks on the two sides future relationship broke down due to "bad faith" by the EU. He defined "bad faith" as a "pattern of refusing to accept reasonable proposals" on the Irish backstop. But he said the question of whether a satisfactory post-Brexit deal on a permanent trading relationship can be reached remained "a political judgment" - and he said MPs should back the PM's deal. In his advice, Mr Cox said "the legal risk remains unchanged" that if a post-Brexit trade agreement can not be reached due to "intractable differences", the UK would have "no internationally lawful means" of leaving the backstop without EU agreement. More reaction from MPs Mrs May earlier addressed a meeting of Conservative MPs, in an effort to change the minds of those opposed to her deal. Conservative MPs leaving the meeting suggested half of those who voted against the deal last time will switch to support it later, said BBC's Chief Political Correspondent Vicky Young. Work and Pensions Secretary Amber Rudd said she believed the prime minister's deal would go through "otherwise instability will follow which would be so unwelcome". But Brexit-backing former foreign secretary Boris Johnson told MPs: "I am afraid this deal has now reached the end of the road and if it is rejected tonight I hope that it will be put to bed." He said the only option to preserve the UK's "self-respect" was to leave on 29 March, without Mrs May's agreement, and then negotiate a free trade deal. But the EU's chief Brexit negotiator Michel Barnier tweeted that the idea of a "transition period" without the withdrawal agreement agreed with Mrs May was a "dangerous illusion" with no legal basis. Brexiteer Conservative MP Andrea Jenkyns said the UK should leave the EU "without a bad deal", adding that the country needed to look "beyond the borders of the EU". Liberal Democrat leader Sir Vince Cable told MPs Brexit will "make this country poorer, weaker and less secure" and called for people to have the final say in another referendum. And leading Tory Remainer Dominic Grieve warned "we are about to do a serious and historic mistake", describing Brexit as "self-mutilation". The SNP's leader at Westminster Ian Blackford urged the prime minister to "extend Article 50 and bring forward another EU referendum". He earned a rebuke from Speaker John Bercow for accusing Mrs May of "sitting there laughing" while he was "talking about the rights that will be taken away from our young people" by Brexit. What was agreed with the EU? Theresa May flew to the European Parliament with Brexit Secretary Steve Barclay on Monday for last-minute talks with Mr Juncker and EU chief Brexit negotiator Michel Barnier. She returned with three documents: Many MPs fear the backstop, initially agreed by the UK government in December 2017, would keep the country in a customs arrangement with the EU indefinitely. The PM has claimed the new documents addresses this issue and urged MPs to back the "improved deal". The EU warns 'this is it' The UK is set to leave the EU on 29 March 2019 after voting to leave by nearly 52% to 48% - 17.4m votes to 16.1m - in 2016. European Commission President Jean-Claude Juncker has warned MPs they would be putting everything at risk if they voted down the deal. "In politics sometimes you get a second chance," he said. "It is what we do with that second chance that counts. There will be no third chance." The Irish Prime Minister Leo Varadkar said the new agreements showed both sides' "good faith" - although he made clear they did "not undermine" the principle of the backstop or how it might come into force. Please upgrade your browser Your guide to Brexit jargon Use the list below or select a button What could happen this week?

Brexit: May in final push to convince MPs to back deal