Questions about Maria Miller's expenses have drawn the Culture Secretary into a further row about her office's dealings with the Daily Telegraph, whose investigation led to the commissioner's inquiry.
An aide to Mrs Miller was reported to have called the newspaper and said she wanted to "flag up" the Cabinet minister's connection to press regulation during discussions about a story on the Cabinet minister's expenses.
Downing Street's top spin doctor, Craig Oliver, also mentioned the Leveson press reforms in a telephone call to the Telegraph's editor.
No 10 insisted yesterday that Mr Oliver was highlighting concerns about the way the Telegraph carried out its investigation into Mrs Miller's expenses claims, rather than attempting to threaten the newspaper.
David Cameron gives his backing to Culture Secretary Maria Miller after a Parliamentary watchdog launches an investigation of her expenses.
The Prime Minister's spokesman insisted he has confidence in his Culture Secretary Maria Miller amid a spat with the Daily Telegraph.