The two men fell out after Mr Sunak's resignation from the cabinet hastened Mr Johnson's exit from office. But, in a new ITV documentary, the Tory leader said he still talks to his predecessor "on occasion", the last time late last year.
He remained tight-lipped about whether he might bring back Mr Johnson, who resigned as an MP after he was found to have lied and lied again over the Partygate scandal, saying that he would "never talk about these personnel things".
David Cameron became foreign secretary last year in a move that also saw him installed in the House of Lords.
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