Earlier administrations have fired and prosecuted government officials who provided classified information to the press. They have also tried to force reporters to identify their sources. But the Bush administration is exploring a more radical measure to protect information it says is vital to national security: the criminal prosecution of reporters under the espionage laws. Such an approach would signal a thorough revision of the informal rules of engagement that have governed the relationship between the press and the government for many decades. Leaking in Washington is commonplace and typically entails tolerable risks for government officials and, at worst, the possibility of subpoenas to journalists seeking the identities of sources. But the Bush administration is putting pressure on the press as never before, and it is operating in a judicial climate that seems increasingly receptive to constraints on journalists. In the last year alone, a reporter for The New York Times was jailed for refusing to testify about a confidential source; her source, a White House aide, was prosecuted on charges that he lied about his contacts with reporters; a C.I.A. analyst was dismissed for unauthorized contacts with reporters; and a raft of subpoenas to reporters […]