Mr. Risen and a colleague at The Times, Eric Lichtblau, won the 2006 Pulitzer Prize for national reporting for their disclosure of the administration’s program of wiretapping without warrants; Mr. Risen’s book expanded on their reporting about the domestic eavesdropping effort.  Mr. Risen, who is based in Washington and specializes in intelligence issues, is the latest of several reporters to face subpoenas in leak investigations overseen by the Justice Department.  A former reporter at The Times, Judith Miller, was jailed for 85 days in 2005 after initially refusing to identify a confidential source to a grand jury that was investigating the leak of the name of a covert C.I.A. operative. Ms. Miller testified after being granted a waiver by her source, I. Lewis Libby Jr., who was Vice President Dick Cheney’s former chief of staff.  Martha K. Levin, executive vice president and publisher of Free Press, which published Mr. Risen’s book and is a unit of Simon & Schuster Inc., said in a statement that “the American people have been well served by Mr. Risen’s reporting.” Ms. Levin’s statement also said that “the ability to publish confidentially sourced information about our government’s practices and policies is one of the bedrock principles of a free and open society.”  A spokeswoman for The Times, Catherine J. Mathis, said the paper “strongly supports Mr. Risen and deplores what seems to be a growing trend of government leak investigations focusing on journalists, particularly in the national security area.”  Ms. Mathis would not say why the material about the C.I.A. program involving Iran appeared in Mr. Risen’s book but not in pages of The Times. “We don’t discuss matters not published in The Times,” she said.  The Justice Department would not comment on the work of the grand jury that issued the subpoena to Mr. Risen. “The department does not comment on pending investigations,” said Peter Carr, a spokesman.  A version of this article appears in print on , on Page A17 of the New York edition with the headline: Times Reporter Subpoenaed Over Source for Book Chapter. Order Reprints| Today's Paper|Subscribe
James Risen’s lawyer said in an interview that the subpoena sought the source of information for a specific chapter of the book “State of War.”