LONDON — Prime Minister Rishi Sunak has denied he had doubts about the government's Rwanda policy when he was chancellor.

Documents seen by the BBC suggest that in March 2022 Sunak had concerns about the cost of sending migrants to the African country.

The papers also indicate he was not sure the plan would stop people trying to cross the English Channel.

Speaking to BBC One's Laura Kuenssberg on Sunday, Sunak said that, as chancellor, he "scrutinized" all plans.

However, he said this did not mean he did not back the Rwanda policy, pointing out that he had funded the plan.

"Just because someone's asking tough questions doesn't mean that they don't believe in the proposal," he said.

Under the scheme, some migrants would be sent to Rwanda for processing and potentially resettlement.

The government has argued this would discourage people from trying to get to the UK in small boats.

The scheme was first announced in April 2022 when Boris Johnson was prime minister.

However it has run into legal difficulties, with the Supreme Court ruling it was unlawful last year.

The BBC has seen No 10 documents that were prepared in March 2022 when then-PM Boris Johnson was trying to persuade Sunak to sign off on funding for the plan.

The papers describe a significant difference of view between No 10 and 11 Downing Street on the effectiveness of the proposed scheme saying the chancellor believes the "deterrent won't work".

They also reveal that No 10 proposed telling Sunak to "consider his popularity with the base" if he was reluctant to sign up to changes to the migration system, including the Rwanda plan.

Labour's shadow home secretary Yvette Cooper said: "These papers show total con of Tories' Rwanda plan and how incredibly weak Rishi Sunak is.

"He knew costs were extortionate and resisted as chancellor. But he's now so weak he's writing £400m checks to Rwanda for no one to be sent."

Asked about the documents on Sunday, Sunak said that he had asked "probing questions of every proposal" that crossed his desk, but added: "To infer from that that I don't believe in the scheme of the principle of deterrence is wrong."

He said the proof was "in his actions" and that as prime minister he was trying to pass legislation to put in place the Rwanda policy.

The legislation, introduced to overcome the objections of the Supreme Court, states that Rwanda should be considered a safe country under UK law.

However, Sunak faced criticism from both sides of his party — with some arguing it would break international law, while others feared it would not go far enough.

After the Safety of Rwanda Bill was announced Robert Jenrick quit as immigration minister describing the legislation as a "triumph of hope over experience" and Suella Braverman, whom Sunak sacked as home secretary, said the bill was "destined to fail".

The bill passed its first stage in the House of Commons with a comfortable majority, but Sunak faces a battle to get it through Parliament when it returns in the coming weeks — BBC