Rishi Sunak is facing a crucial vote on his Rwanda bill, after two Conservative deputy chairmen and a ministerial aide resigned to rebel over the issue.
On Tuesday Lee Anderson, Brendan Clarke-Smith and Jane Stevenson stepped down to vote for changes they said would toughen up the legislation.
In a blow to the PM’s authority, 60 Tory MPs backed rebel amendments.
No 10 is confident the bill as a whole will still pass later, but is thought to be preparing to offer concessions.
MPs are set to continue debating proposed changes to the legislation in the Commons on Wednesday, with the bill put to a vote afterwards if it remains unamended.
If around 30 Tory MPs join opposition parties in voting against the bill at its final Commons hurdle, it could be defeated.
At least four Conservative MPs – including former ministers Robert Jenrick and Suella Braverman – have publicly said they are prepared to vote against the bill if it is not improved.
But it is unclear how many more could join them.
Miriam Cates, one of those who voted for Tuesday’s amendments, told the BBC she would “potentially” be prepared to vote against the entire bill.
“But we’ve got 24 hours – that’s a long time in politics. We’ve got more votes tomorrow on more amendments so we’re not at that position yet where we can make that decision,” she said.
Even a government victory would come at a political cost, with debates over the issue exposing the extent of divisions within the Conservative Party.
A significant rebellion would also be damaging to the prime minister, who has made the Rwanda policy central to his pledge to stop small boats crossing the Channel.
The bill seeks to deter Channel crossings by reviving the government’s plan to send some asylum seekers to Rwanda.
If it is approved by MPs, the government still faces a challenge to get it through the Lords, where it is likely to encounter further opposition.
‘Watertight’
On Tuesday evening, Mr Sunak suffered his biggest rebellion since becoming prime minister, when 60 Conservatives defied the government to back changes to the bill put forward by MPs on the right of the party.
Shortly before the votes, Mr Anderson and Mr Clarke-Smith announced they were resigning to support the amendments.
The pair said they were not against the bill but wanted to make sure it was “watertight”.
Ms Stevenson, a parliamentary private secretary in the Department for Business and Trade, also confirmed she had offered her resignation after voting for the rebel amendments.
The proposals – which aimed to prevent any international law being used to block someone’s removal to Rwanda and severely limit an individual’s ability to appeal their deportation – were defeated.
But they still secured significant backing from senior Tories, including former home secretary Mrs Braverman and former prime minister Liz Truss.
Mr Sunak has so far resisted giving in to the demands of his critics on the right of the party – and if he did, this could risk losing support among more centrist MPs.
However, in a bid to appease some of these critics, the BBC understands the government is considering a concession that would see official guidelines changed to introduce a presumption that rulings from the European Court of Human Rights blocking deportations could be ignored.
Labour said the resignations showed Mr Sunak was “too weak to lead his party and too weak to lead the country”.
“These resignations show that even senior Tories think that the Conservatives have failed and is yet more evidence of the total Tory chaos over their failing Rwanda gimmick – yet they are still making the taxpayer pay the extortionate price,” the party’s national campaign coordinator, Pat McFadden, said.