The Justice Department will continue Bush administration attempts to block certain lawsuits by claiming they threaten state secrets, but the agency announced Wednesday it will try to curb the use of such claims in the future.
Attorney General Eric Holder said he and a larger group of Justice Department lawyers will personally review such claims.
During the Bush administration, the so-called state secrets privilege was invoked to quash lawsuits filed by people claiming they had been tortured or illegally wiretapped.
The Bush administration argued in those cases and the Obama administration still argues in a few cases alive in the courts that the lawsuits must be dismissed because evidence in the case would harm national security.
In a statement, Holder said the new policy "sets out clear procedures that will provide greater accountability and ensure the state secrets privilege is invoked only when necessary and in the narrowest way possible."
The administration's move could quell efforts in Congress to pass a law curbing the use of state secrets claims.
Sen. Patrick Leahy, the Democratic chairman of the Senate Judiciary Committee, praised Wednesday's announcement, but added he remains "especially concerned" that the government should be required to show significant evidence to a judge when seeking to assert the privilege, and said he hoped the Obama administration would work with Congress to establish such a requirement.
Under the new approach spelled out by Holder, an agency trying to hide such information would have to convince the attorney general and a panel of Justice Department lawyers that its release would compromise national security.
In the past, such government claims of state secrecy required a lower standard of proof that the information was dangerous, as well as the approval of fewer officials.
The government says it will also submit evidence to a judge to buttress its claims of state secrets, but the policy document doesn't say what type of evidence, or how much.
The Bush administration was criticized for invoking state secrets claims in lawsuits challenging post-Sept. 11 anti-terrorism programs, and the incoming Obama administration had promised a thorough review of such claims.
Yet in conducting its review, the Obama administration has continued to assert the privilege in all the current cases.