“I was nervous for a long time, but they’ve been after me for six years so now I try to ignore it,” he said, musing that he’s already decided what he’ll take to prison: Civil War books and World War II histories.

The Justice Department is trying to scuttle the reporters’ privilege — ignoring the chilling effect that is having on truth emerging in a jittery post-9/11 world prone to egregious government excesses.

Attorney General Eric Holder wants to force Risen to testify and reveal the identity of his confidential source on a story he had in his 2006 book concerning a bungled C.I.A. operation during the Clinton administration in which agents might have inadvertently helped Iran develop its nuclear weapon program. The tale made the C.I.A. look silly, which may have been more of a sore point than a threat to national security.

But Bush officials, no doubt still smarting from Risen’s revelation of their illegal wiretapping, zeroed in on a disillusioned former C.I.A. agent named Jeffrey Sterling as the source of the Iran story.

The subpoena forcing Risen’s testimony expired in 2009, and to the surprise of just about everybody, the constitutional law professor’s administration renewed it — kicking off its strange and awful aggression against reporters and whistle-blowers.

Holder said in May that “no reporter who is doing his job is going to go to jail,” trying to show some leg and signal that his intention is benign, merely to put pressure on Sterling so that he will plead guilty before his trial.

The president and the attorney general both spoke nobly about the First Amendment after two reporters were arrested in Ferguson, Mo., while covering the racial protests in the wake of Michael Brown’s death.