Theresa May faces a knife-edge Commons vote on a key area of Brexit policy amid last-ditch attempts from different factions to secure victory.
Pro-EU Tories have threatened to rebel to ensure parliament is given a greater say in the case of a no-deal Brexit however ministers are thought to be quietly confident of seeing off the uprising.
With the vote so close, MPs who are heavily pregnant may have to turn up in the division lobbies as proxy voting plans have not been implemented.
Jo Swinson, the Liberal Democrat deputy leader, is already past her due date, while Labour shadow ministers Cat Smith and Laura Pidcock are also in the latter stages of pregnancy.
At least one Labour MP and possibly more are thought to be coming from hospital to vote.
Earlier, Ms May clashed with Jeremy Corbyn over her announcement of more funding for the NHS to mark its 70th anniversary.
Mr Corbyn said Ms May’s figures were “so dodgy they belong on the side of a bus”.
See below for live updates
Live Updates
16:06
The Commons has accepted the other House of Lords amendment. The “meaningful vote” motion was the only remaining issue of real contention. Pending any other surprise interventions from peers later today, the government has got its bill through largely unscathed. You can almost hear the sighs of relief in No 10.
16:02
***MPs have voted down the Lords’ amendment by 319 votes to 303***
15:58
Vote result coming up any second now....
15:55
Labour MP Naz Shah, who has been ill recently, is wheeled into the chamber in a wheelchair, wearing a hospital bracelet. The government reportedly refused to agree to the normal convention that says unwell MPs are allowed to be counted from the Commons car park...
15:46
MPs are now voting on the amendment. After all the speculation about potential defeats, we’re expecting the government to win fairly comfortably.
David Davis and Keir Starmer are having a very sombre-looking conversation in the middle of the chamber as voting takes place...
David Davis and Keir Starmer are having a very sombre-looking conversation in the middle of the chamber as voting takes place...
15:44
Anna Soubry confirms she will also vote for the amendment.
She says doing so “is in the interests of all my constituents”.
Speeches have been cut to two minutes, so she doesn’t have time for much else.
She says doing so “is in the interests of all my constituents”.
Speeches have been cut to two minutes, so she doesn’t have time for much else.
15:40
Labour’s Chris Leslie says Dominic Grieve has succeeded in getting ministers to back away from the claim, made by Theresa May at the weekend, that Parliament “cannot bind the hands of government”.
However, he says, he disagrees with Mr Grieve on whether ministers’ words can be trusted. He says, after last week’s events, he does not believe any government guarantees should be believed.
However, he says, he disagrees with Mr Grieve on whether ministers’ words can be trusted. He says, after last week’s events, he does not believe any government guarantees should be believed.
15:37
Veteran Europhile Ken Clarke criticises the government for allowing only a 90-minute debate on the meaningful vote amendment.
He says he thought the government would be defeated last week but that Mr Grieve and others backed down after they secured “undertakings from the prime minister”.
He says the government is now resisting the very compromise that ministers had last week agreed with Tory rebels.
He says he thought the government would be defeated last week but that Mr Grieve and others backed down after they secured “undertakings from the prime minister”.
He says the government is now resisting the very compromise that ministers had last week agreed with Tory rebels.
15:28
Antoinette Sandbach, a potential Tory rebel, says a no-deal Brexit would be "catastrophic". She says the amendment being debated would not tie ministers' hands during negotiations, given it concerns steps that would only be taken if negotiations break down.
She says the amendment will ensure the EU knows Theresa May is negotiating with the full support of Parliament:
"Far from binding the prime minister, it strengthens her hand."
It sounds like Sandbach will still vote for the amendment, as other Tories are certain to. However, with Grieve having pulled his support, the chances of it passing are virtually nil.
15:20
Hillary Benn, chair of the Commons Brexit committee, says Dominic Grieve should be “very, very cautious” about accepting ministers’ assurances given he received similar guarantees last week, before the government backed away from the compromise deal agreed with potential rebels.
Benn says the government's policy throughout negotiations has been to try to "neuter this House when we come to the end of the process".
15:09
Why did Dominic Grieve back down? No one is entirely sure. He suggested he had received enough assurances from ministers about the supremacy of Parliament over the government, but the government’s position has not significantly changed in recent days. It’s a big win for No 10 and the Conservative whips, but Mr Grieve and his allies are likely to face questions as to they again caved in at the last minute.
15:00
And there we go. Dominic Grieve caves in, saying he is happy to support the government’s amendment. It looks like he will still allow MPs to vote on his amendment, but he seems to be willing to step into line having secured, he says, confirmation from ministers that they accept Parliament is sovereign over the executive.
14:58
Dominic Grieve says the government’s proposals would rely entirely on Commons Speaker John Bercow interpreting what rights Parliament should have if no Brexit deal is agreed.
He says failure to secure a deal would ne “one of the biggest political crises in modern British history”.
He says failure to secure a deal would ne “one of the biggest political crises in modern British history”.
14:51
Dominic Grieve is now speaking. He says Theresa May promised to meet Tory backbenchers’ concerns about Parliament not having a meaningful vote in the case of a no-deal Brexit.
He says it was “unfortunate” that ministers reneged on the compromise deal they agreed with him last week.
He says it was “unfortunate” that ministers reneged on the compromise deal they agreed with him last week.
14:46
Keir Starmer, Labour’s shadow Brexit secretary, says divisions in the Conservative Party are the biggest threat to an orderly Brexit.
14:37
Tory rebels seem to be stepping into line one-by-one... Here Nicky Morgan, the former education secretary, confirms she will back the government.
