MPs from the European Research Group (ERG), New Conservatives and the Common Sense Group came together last night in a meeting which one former minister described as “very bracing”.

Around 30 MPs – including the two former Home Secretaries Braverman and Priti Patel – attended the meeting, hosted by the ERG.

The so-called ‘Star Chamber’ of lawyers, which scrutinised many of the Brexit deals, is set to look at James Cleverly’s new plan to send flights to Rwanda and provide an answer on whether it will successfully facilitate the scheme in the coming days.

A source inside the meeting told GB News: “We’ve only seen a treaty. The important bit will be the Bill.

“The Bill will have to meet the obstacles identified in the Supreme Court judgment.

“Anything less won’t work and frankly it would be pointless to introduce a Bill that doesn’t achieve that.”

Another ERG source told GB News that MPs in attendance at the meeting were “united and focussed” on the issue at hand.

In a statement after the meeting, ERG Chairman Mark Francois said: “Our ERG Meeting this evening, which also included members of the New Conservatives and the Common Sense Group, resolved to refer the Rwanda Bill, as soon as it is published, to the ‘Star Chamber’ of legal experts, chaired by Sir Bill Cash.

“The Star Chamber will be asked to decide on the following question: ‘Whether the Bill fully respects Parliamentary Sovereignty, with unambiguous wording, which would facilitate flights to Rwanda.’

“The Star Chamber will complete this tasks in days, not weeks.”

If the Star Chamber finds that the new Bill does not go far enough to be approved by the Supreme Court, the joined-up group of rebels would constitute a major rebellion for the Prime Minister.

But today’s statement from Braverman, given weeks after she was sacked as home secretary, is likely to come ahead of the Star Chamber’s verdict.

James Cleverly announced a new treaty with Rwanda yesterday, which Rwanda’s foreign affairs minister Vincent Biruta said would “strengthen” the asylum processing system.

As part of the treaty, a new appeals process will be established within Rwanda’s high court to handle exceptional cases with British and Commonwealth judges, as well as Rwandan judges, presiding over the appeal court hearings.

ADDITIONAL REPORTING BY CHRISTOPHER HOPE