Labour says Rishi Sunak should be “honest” with the public by publishing documents which appear to show he had doubts about the Rwanda scheme to stop small boats from crossing the Channel.

Documents seen by Sky News suggest the prime minister was sceptical about government plans to send illegal migrants to the African country.

Mr Sunak expressed his doubts while he was chancellor in March 2022, shortly before the Rwanda scheme was first announced by Boris Johnson’s government.

The existence of the Number 10 briefing papers was widely reported on Saturday.

Now the Labour Party is urging Mr Sunak to “come clean”.

Watch Wilfred Frost’s live interview with Labour leader Sir Keir Starmer on the Sunday Morning With Trevor Phillips show on Sky News from 8.30am on Sunday.

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The papers revealed this weekend suggest the now prime minister had particular concerns about the costs of the scheme.

It has since been made public that the government has committed at least £400m to the Rwandan government, despite not a single person being removed to Rwanda.

The papers also appear to show Mr Sunak doubted the effectiveness of his now flagship policy, saying the then chancellor believed the “deterrent won’t work”.

A government source said Mr Sunak has put the Rwanda policy at the heart of his plan for government, and as chancellor, funded the scheme.

The government’s Rwanda Bill will return to the House of Commons this month.

Yvette Cooper, Labour’s shadow home secretary, said: “The more we hear about the government’s Rwanda scheme, the more obvious it becomes that this is an extortionate con that won’t fix the Tory chaos in our immigration system.

“The home secretary, the former immigration minister and now the prime minister clearly don’t believe the government’s plans will work.

“It’s time the Tory government was honest with the public, and publish both the papers outlining Rishi Sunak’s concerns and the full details of the cost of the scheme.

“In a few weeks’ time, the prime minister will ask his divided and sceptical backbench MPs to vote for a Rwanda scheme he clearly doesn’t believe in and which he refuses to set out the costs for.

“They should stop wasting time on this costly charade and adopt Labour’s plan to go after the criminal smuggling gangs, negotiating new security arrangements with Europe to better protect our borders and set up a new returns unit to ensure those with no right to be in the UK are swiftly removed.”

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After the reports about Mr Sunak’s doubts on Saturday, a government source said: “As chancellor, Rishi funded the Rwanda scheme and put it at the heart of his 10-point plan the month after becoming PM.

“Now he is passing the Rwanda Bill following the Supreme Court judgment to get flights off the ground.

“He is the first prime minister ever to oversee a reduction in small boat crossings, which were down by 36% last year.”