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Brexit: What to expect from Parliament's Saturday sitting Saturday's Brexit votes in Parliament: What's going on?
(about 16 hours later)
Parliament is sitting on a Saturday for the first time in 37 years to debate and vote on Boris Johnson's Brexit deal - here is what to expect.Parliament is sitting on a Saturday for the first time in 37 years to debate and vote on Boris Johnson's Brexit deal - here is what to expect.
What time is Parliament sitting? What is happening?
MPs will gather in the House of Commons at 09:30 BST. We don't know what time they will finish. MPs began their special session at just after 09:30 BST. We don't know what time they will finish amid uncertainty over the votes.
Peers sit a little later at 10:00 and are due to finish at 15:00.Peers sit a little later at 10:00 and are due to finish at 15:00.
What will happen then? Commons proceedings got under way with a statement from Prime Minister Boris Johnson and a response from Labour leader Jeremy Corbyn.
Commons proceedings will get under way with a statement from Prime Minister Boris Johnson, as confirmed by Saturday's order paper. The prime minister is expected to take questions on his Brexit deal from MPs for a couple of hours before the main debate gets under way.
He is expected to take questions on his Brexit deal from MPs for a couple of hours. What time will voting get under way?
The main debate on the deal will follow. Commons Speaker John Bercow will reveal which amendments - suggested changes to the government's motion asking MPs to approve the deal - have been selected. It's likely to begin after 14:30 but the timings have yet to be announced.
A government minister, yet to be confirmed by Downing Street, will then open the debate. There could be up to four votes - or no votes at all.
What time can the voting start on Mr Johnson's deal? Commons Speaker John Bercow has selected two amendments to be voted on by MPs.
It's likely to begin after 14:30. They are:
If there are amendments selected by the Speaker, the votes on these will be held first. The first vote will be on the Letwin amendment, if it is moved.
So we can't at this stage say exactly when the vote on the prime minister's deal will be held. This could be followed by a vote on the main government motion - whether or not to back the deal.
But things may become clearer at the start of the debate on Saturday. The government does not want this vote to happen if MPs back the Letwin amendment, as it could delay Brexit.
It is not clear at this stage how they would prevent the vote happening - it's possible Tory MPs could abstain - but the motion has already been tabled.
If it does take place, and MPs reject the deal, we could then move to votes on a second government motion on whether or not there should be a no-deal Brexit.
Before a vote takes place on that, MPs could get a chance to vote on the cross-party amendment rejecting a no-deal Brexit and seeking another referendum.
MPs would then vote for a fourth time on the government no-deal motion. We know there is a majority in the Commons against a no-deal Brexit, so this would be unlikely to pass.
Regardless of what happens on Saturday, the government has said it plans to push ahead with the legislation enacting the treaty agreed by Boris Johnson in Brussels - the Withdrawal Agreement Bill.
They plan to hold the second reading of that bill on Tuesday, which would give MPs a chance to register their support - or not - for Boris Johnson's Brexit deal.
What happens if MPs vote for the deal?
If the government motion is passed by MPs without being amended, it will just be the first stage of getting the deal into law.
The government is likely to want to move quickly so it can meet Boris Johnson's 31 October deadline.
The Withdrawal Amendment Bill, which implements the legally-binding treaty, will be presented to Parliament early next week - something the government now plans whatever happens in Parliament on Saturday.
How can you follow the debate?How can you follow the debate?
You can find out the latest developments on the BBC News website and app, where we'll have live coverage in text and video and analysis from our experts. You can find out the latest developments on the BBC News website and app, where we'll have live coverage in text and video, and analysis from our experts.
There will also be coverage on BBC One from 09:00 to 13:15, BBC Two from 13:15 to 16:30, and continuous coverage on the BBC News Channel.There will also be coverage on BBC One from 09:00 to 13:15, BBC Two from 13:15 to 16:30, and continuous coverage on the BBC News Channel.
There will also be extended editions of BBC News at Six and News at Ten, as well as a special edition of BBC Newsnight.There will also be extended editions of BBC News at Six and News at Ten, as well as a special edition of BBC Newsnight.
What happens if MPs vote for the deal?
If the government motion is passed by MPs without any amendments, it will just be the first stage of getting the deal into law.
The government is likely to want to move quickly so it can meet Boris Johnson's 31 October deadline.
The Withdrawal Amendment Bill, which implements the legally-binding treaty, could be presented to Parliament early next week.
If the government motion is passed with amendments, then a delay to Brexit becomes more likely.
What happens if MPs reject the government's motion?
If MPs reject the deal, there is the possibility they could be given the chance to vote in favour of a no-deal Brexit - listed as a second government motion on the Commons order paper.
Labour MP Peter Kyle has tabled an amendment to this second motion that rejects leaving without a deal and says any "final decision" on the UK and EU's future relationship should be subject to a confirmatory referendum.
However, MPs have previously rejected the proposals of leaving without a deal, so it's unlikely this government motion will pass if it is put to the House.
So, with no approval for either a deal or no-deal, the prime minister will have to write to the EU to request a Brexit extension.
What are the amendments?
MPs have tabled three amendments to the government motion on Mr Johnson's Brexit deal so far. However, this does not mean they will automatically be debated and voted on by MPs - Mr Bercow will have to select them for debate.
There are two from the SNP:
Mr Blackford has called on opposition parties to "quit dithering, back our amendment, and finally act to bring this appalling Tory government down and stop Brexit".
He and his party are against Mr Johnson's Brexit deal, which Mr Blackford has said would be "devastating for Scotland".
The third amendment, which has cross-party support, increasing its chances of being selected, is:
Labour's Hilary Benn, Lib Dem leader Jo Swinson and Plaid Cymru's Westminster leader Liz Saville Roberts - as well as former ministers David Gauke and Philip Hammond - have thrown their weight behind this proposal.
Mr Letwin's aim is to prevent a no-deal Brexit, even if MPs back Mr Johnson's deal. He his concerned that some MPs who vote for it might change their mind as the legislation passes through Parliament - or it could be held up in the House of Lords.
So, if this proposal - you'll hear it referred to as the "Letwin amendment" - is passed by MPs along with Mr Johnson's Brexit deal, the prime minister would still have to write a letter on Saturday requesting a further postponement of Brexit until 31 January.
Why is the Letwin amendment significant?Why is the Letwin amendment significant?
The latest gambit by the alliance of MPs around Sir Oliver Letwin looks like a real problem for the government whips, writes our parliamentary correspondent Mark D'Arcy.The latest gambit by the alliance of MPs around Sir Oliver Letwin looks like a real problem for the government whips, writes our parliamentary correspondent Mark D'Arcy.
The lesson of the Brexit battles so far is that it is the cross-party amendments and motions that are the most dangerous.The lesson of the Brexit battles so far is that it is the cross-party amendments and motions that are the most dangerous.
Single-party proposals are mostly efforts to signal a position, it's the proposals that MPs from several parties can sign up to that pose a more serious threat.Single-party proposals are mostly efforts to signal a position, it's the proposals that MPs from several parties can sign up to that pose a more serious threat.
It's a cunningly crafted proposition which, crucially, could be voted for by MPs who want a deal, but don't trust this one, and don't trust the government.It's a cunningly crafted proposition which, crucially, could be voted for by MPs who want a deal, but don't trust this one, and don't trust the government.
It rests on the idea that were Parliament to approve the deal for the purposes of the Benn Act now, there might then be a danger that the subsequent legislation to enact it might be, somehow, derailed, resulting in a no-deal exit on 31 October.It rests on the idea that were Parliament to approve the deal for the purposes of the Benn Act now, there might then be a danger that the subsequent legislation to enact it might be, somehow, derailed, resulting in a no-deal exit on 31 October.
Read Mark's full blogRead Mark's full blog
What happens if the Letwin amendment passes?
If it passes, and the main motion - approval for Mr Johnson's Brexit deal - passes as amended: