Glenn Greenwald, one of the journalists who broke the National Security Agency revelations from Edward Snowden in the Guardian, said on Sunday a book he is writing about the case will contain “a lot of new stories from the Snowden archive”.

Speaking to Brian Stelter, the host of CNN's Reliable Sources, at the end of a week in which Guardian US and the Washington Post shared a Pulitzer prize for public service reporting, Greenwald said: “There are stories that I felt from the beginning really needed the length of a book to be able to report and to do justice to, so there’s new documents, [and] there’s new revelations in the book that I think will help inform the debate even further.”