Attorney General Eric Holder, in a letter to the House Judiciary Committee, maintains that he didn't lie to members of Congress when he said that the Justice Department was not moving to prosecute journalists who publish classified information.

Eric Holder (AP Photo) Eric Holder (AP Photo)

House Republicans have opened a perjury inquiry, arguing that Holder's statement doesn't square with the department's labeling of Fox News reporter James Rosen as a potential "co-conspirator" in court documents used to monitor Rosen.

"I do not agree that characterizations establishing probable cause for a search warrant for materials from a member of the news media during an ongoing investigation constitute an intent to prosecute that member of the news media," Holder wrote. "I do believe that a thorough investigation of the disclosure of classified information that threatened national security was necessary and appropriate."