Dominic Cummings claims he was in the room when Boris Johnson was warned off giving a peerage to Evgeny Lebedev.
Mr Johnson's former chief aide accused deputy PM Dominic Raab of inadvertently misleading MPs by branding the clams "nonsense" at PMQs.
At PMQs, Labour's Angela Rayner demanded to know if the Prime Minister challenged security services advice to give his pal Evgeny Lebedev, media mogul and son of ex-KGB agent Alexander, a peerage in 2020.