With 650 MPs holding a variety of opinions on how best to deal with the referendum result, Theresa May faces an uphill struggle to get her deal for Brexit approved. Who are the people with influence to bear over others in the vote?
Here’s our handy guide:
John Bercow
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Who? MP for Buckingham and Speaker of the House of Commons.
Leave or Remain? Remain, although the speaker of the house should stay neutral in parliamentary debates
What does he want? The speaker's role is to act in the best interests of the House of Commons, but a recent decision has brought him under fire from MPs accusing him of siding with remainers.
Last week, Mr Bercow approved an attempt to change what would happen in the event that Mrs May loses her vote on Tuesday.
He allowed an amendment tabled by Dominic Grieve to require the prime minister to present an alternate plan within days if she loses Tuesday’s vote. Under usual parliamentary procedure if the deal was not passed, the government have to come back within 20 days; under the amendment, this would be cut to three.
He has also been criticised for an anti-Brexit car sticker which he claimed was in his wife’s car.
Anna Soubry
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Who? Conservative MP for Broxstowe and minister for small business until July 2016, Ms Soubry hit the headlines last week as pro-Brexit campaigners in yellow vests harassed her outside parliament, one calling her a "Nazi".
After the thugs chanted Nazi at Anna Soubry while she was on BBC, I went to check on her. But she had company... pic.twitter.com/II7nIdqMoF
— Femi (@Femi_Sorry) January 7, 2019
Leave or Remain? Remain
What does she want? Ms Soubry supports a second referendum, forming part of the cross-party People's Vote campaign. In a note to her constituents ahead of Tuesday's vote, she said she would vote against Mrs May's withdrawal agreement.
After two and a half years #Parliament is finally taking back control of #Brexit on behalf of all the people of the United Kingdom
— Anna Soubry (@Anna_Soubry) January 9, 2019
“I do not seek to “thwart” or stop Brexit. Only the British people can do that if that is what they want,” she wrote.
“I do believe the Prime Minister’s deal should be put back to the public in a People’s Vote or second referendum. I also believe the option of remaining in the EU should be on the ballot paper and accept there is an argument for a “no deal” Brexit option as well.”
Jacob Rees-Mogg
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Who? Conservative MP for North East Somerset and leader of the European Research Group which favours a hard Brexit. Mr Rees-Mogg was a leading campaigner for the Leave campaign in 2016 and co-founded investment firm Somerset Capital Management.
Leave or Remain? Leave
What does he want? A favourite of the various TV crews parked outside the Houses of Parliament for his pomp and old-fashioned demeanour, Mr Rees-Mogg is against Theresa May's withdrawal agreement. When Mrs May delayed the original December vote on the issue, Mr Rees-Mogg was one of 48 Conservative MPs who submitted a letter of no confidence, triggering a leadership challenge which ultimately failed to oust the PM. On Sunday he took to Twitter to declare "no deal is still better than a bad deal".
Dennis Skinner
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Who? MP for Bolsover and political firebrand, Mr Skinner is Labour's longest-serving representative. The 86-year-old backbencher, known for his cantankerous speeches in Parliament, is a staunch eurosceptic.
Leave or Remain? Leave
What does he want? Mr Skinner criticised Mrs May for delaying the vote on her deal with the EU in December. "Doesn't the Prime Minister realise that she's handed over power, not to people in this House, but she's handed over power to the people she's going to negotiate with – over in Europe?" he said in parliament.
He is expected to vote against Mrs May’s deal on Tuesday evening.
Sammy Wilson
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Who? DUP MP for East Antrim in Northern Ireland. The DUP has a confidence and supply arrangement with Mrs May's Conservative party, with 10 MPs in Parliament helping her party to pass legislation.
Hoot for Brexit! Thanks to @eastantrimmp Sammy Wilson MP for joining us at the @LeaveMnsLeave protest today! #LetsGoWTO pic.twitter.com/uzAl6Rahig
— Leave Means Leave (@LeaveMnsLeave) January 14, 2019
Leave or Remain? Leave
What does he want? Mr Wilson's concern is with the Irish border. On Tuesday, he declared his intention to vote against May's deal due largely to the Northern Irish backstop. The backstop is currently written into May's deal as a temporary measure to prevent the return of a hard border between Ireland, and thus the EU, and Northern Ireland.
No British Government or NI Assembly will be able to escape the legally binding commitments which would prevail if this diabolical deal were to pass. Meaningless assurances won’t cut it. Paragraph 50 must be respected. pic.twitter.com/BNKk4ZSUKq
— Sammy Wilson MP (@eastantrimmp) January 9, 2019
However, the backstop will means that goods coming into Northern Ireland would still be subject the EU standards. This would result in a temporary single custom territory covering the whole of the UK in the customs union until a better plan is worked out.
“Government ‘pledges’ on the backstop could be written in blood and still wouldn’t change the reality or legality of this diabolical deal. We will vote it down” he wrote on Twitter.
Sir Desmond Swayne
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Who? Former banker and Conservative MP for New Forest West.
Leave or Remain? Leave
What does he want? Reading this list may lead you to believe that Mrs May has little support for her deal, but one prominent Brexiteer has hinted he will support it to avoid being on the same side as those who wish to prevent Brexit.
“This deal is better than staying in the EU – we will be out of the Common Fisheries Policy, out of the Common Agricultural Policy, out of the relentless momentum for political integration,” he said.
“I’m very much aware that the events and the votes of last week present a danger to Brexit.”
He said he didn’t want to vote with “those who are there because their strategy is actually to prevent Brexit at all,” he told lawmakers.