The revised procedures are designed to give news organizations an opportunity to challenge any subpoenas or search warrants in federal court.

News organizations are to be informed of an impending document demand unless the attorney general determines that notice would pose "a clear and substantial threat to the integrity of the investigation, risk grave harm to national security or present an imminent risk of death or serious bodily harm," the new rule says.

The rule emphasizes that members of the Justice Department may apply for a search warrant to obtain a journalist's materials only when that person is a focus of a criminal probe for conduct outside the scope of ordinary newsgathering.