Lord Justice Leveson's long-awaited report into press standards will be published later amid fears its recommendations could throw the Government into turmoil.
David Cameron will respond to the recommendations in the Commons this afternoon, but in an extraordinary move his deputy Nick Clegg is preparing to make his own statement.
Sky sources say this is not indicative of a major coalition split and aides stress there are areas of agreement, but it will fuel concern about deep divisions within the Government.
Lord Justice Leveson's 2,000-page document will be unveiled at 1.30pm, with the judge widely expected to suggest a new regulator for newspapers underpinned by law.
His inquiry was set up by the Prime Minister last July after it emerged the News Of The World hired a private detective to hack murdered schoolgirl Milly Dowler's phone.