NBC: AG Holder signed warrant to seize Fox reporter's private e-mail

Attorney General Eric Holder personally signed off on the search warrant that named Fox News reporter James Rosen as a potential criminal "co-conspirator," a law enforcement official told NBC News.

That controversial warrant, revealed for the first time earlier this week, enabled federal law enforcement officials to seize Rosen's private emails as they sought to determine who leaked the journalist confidential intelligence about North Korea. The move, coupled with the Justice Department's recent seizure of the phone records of Associated Press reporters and editors, has led to tough questions for the White House about press freedoms. The revelation that Holder personally signed off on the warrant also comes on the same day that President Obama announced the attorney general would lead a review into Justice Department guidelines on leak investigations.