No10 tees up make-or-break showdown with Tory rebels on Rwanda: Rishi Sunak 'threatens to call election' if he loses vote on plan next week as Braverman wades in again demanding he 'changes course' after Robert Jenrick's 'petulant' resignation

Rishi Sunak could threaten to call an election if Tory rebels wreck his new Rwanda plan as the party plunges deeper into chaos.

Downing Street is said to be mulling making a crucial showdown on the legislation next week a confidence issue. By convention that would mean the PM either resigning or dissolving Parliament if he loses.

The extraordinary tactic is on the table after the bombshell resignation of immigration minister Robert Jenrick last night. He quit just hours after the Bill was published, saying it had no chance of getting deportation flights to the African country running.

Former Home Secretary Suella Braverman stepped up her attack with an interview on BBC Radio 4's flagship Today programme this morning.

She demanded Mr Sunak 'changes course' and refused explicitly to back him continuing as leader.

One former Cabinet minister told MailOnline that No10's tactic would backfire by bringing a no-confidence vote closer. 

'It will make it worse for him. People will support them on second reading and then just put their letters in,' they said. 

Touring broadcast studios this morning, Northern Ireland Secretary Chris Heaton-Harris also signalled doubts about the idea. He said it was decision for the whips but 'I can't see why it would need to be because I think all Conservatives will vote for it'.

With Ms Braverman also attacking the Rwanda legislation as too weak and many right-wingers sharing concerns, it is unclear whether the government will have the numbers to get the proposals through the Commons unamended. It will then face an even rougher ride in the Lords. 

A febrile mood has descended on the party again in the wake of the dramatic events, with veteran MPs bemoaning the 'complete mess' over Mr Sunak's vow to 'Stop the Boats'. The PM warned a meeting of the powerful 1922 Committee last night that it was time to 'unite or die'.  

Mr Sunak had urged factions to pull together to fight Labour instead of themselves after publishing emergency legislation he hopes will finally get the deportation flights off the ground.

Though Mr Sunak said his new Bill would ensure 'our plan cannot be stopped', following defeat in the Supreme Court, he faced immediate criticism from the Right of the party, who felt it did not go far enough.

The PM issued an ultimatum to his party to 'come together as a team' during a tub-thumping appearance before Tory MPs at the 1922 Committee, where he described the legislation as the 'toughest piece of anti-illegal immigration law that we've ever put to the House'.

Mr Sunak said it needed to be passed with a strong majority to 'throw down the gauntlet to the Lords', where it could face tough opposition.

But he faced immediate criticism for shunning the most hardline option and not providing powers to ignore the European Convention on Human Rights.

In a scathing resignation letter, Mr Jenrick described the legislation as 'a triumph of hope over experience'. 

But a senior Tory source hit back, labelling Mr Jenrick's desertion 'a disgrace'. 

The source said: 'The PM is trying to solve a serious problem – this is just petulant. It is just treacherous. 

'They are trying to destroy the party, throwing their toys out of the pram to seek attention.

'If you are genuinely serious about reducing immigration into this country – legal and illegal – you don't quit. The sure-fire way to get the opposite is if Keir Starmer becomes prime minister.'

Mr Jenrick had been on the brink for days, demanding the UK should remove obstacles to Rwanda deportations by opting out of European human rights laws. Last night he conceded he was 'unable to take the currently proposed legislation through the Commons as I do not believe it provides us with the best possible chance of success'.

He wrote: 'The stakes for the country are too high for us not to pursue the stronger protections required to end the merry-go-round of legal challenges which risk paralysing the scheme and negating its intended deterrent.'

Former home secretary Suella Braverman, who was sacked last month, said the Bill was 'fatally flawed' and 'won't stop the boats'. But a Government source told the Mail 'there is no Suella option on the table here' because both Rwanda and the UK want to stay within international law. 

Meanwhile a veteran Tory MP told the Mail last night that the view among MPs was that Mrs Braverman 'repeated what she had said before, but it is time to move on'.

'The die-hards around her will cheer, but many others will say, 'You've made your point, now stay silent, let's move on – we've got an election to fight',' they said.

Rwanda's foreign affairs minister Vincent Biruta said his country would not continue with the deal if it broke international law.

Speculation about Mr Jenrick's position reached fever pitch because he was nowhere to be seen while Home Secretary James Cleverly made a statement to MPs on the legislation at 6pm last night, 90 minutes after it was published.

The Bill – intended to overcome the Supreme Court ruling last month which declared the scheme unlawful – will disapply parts of the Human Rights Act and 'unambiguously' prevent meddling by the courts, Mr Cleverly said. 

It also sets out that only ministers – and not unelected judges – can decide whether to comply with Strasbourg injunctions designed to block the scheme.

However, Tory Right-wingers were angered by the inclusion of an apparent loophole which will allow those selected for removal to Rwanda to lodge legal challenges based on 'individual circumstances'.

Mr Sunak won support from more centrist MPs, including the One Nation group. Tory whips had warned him that as many as ten ministers could quit if the Government tried to override the ECHR.

When he made his plea for unity last night, Mr Sunak referred to his first appearance before the 1922 Committee after being elected Tory leader just over a year ago. Back then, he warned fractious MPs they must 'unite or die'. Last night he said this was 'one of those moments'.

Tory MP Bob Seely said MPs heeded Mr Sunak's call, saying they should 'stick together'. He told Times Radio: 'These are complex problems. You've got 100million people globally on the move over the next few years and we simply cannot throw open our welfare state to anyone who can get here.'

Last night, Mr Sunak wrote to Mr Jenrick saying he had a 'fundamental misunderstanding' of the Bill. The PM said his resignation was 'disappointing' and added that Rwanda would not accept a scheme in breach of international law.

Mr Sunak added: 'There would be no point in passing a law that would leave us with nowhere to send people to.'