"As we have done before in rare instances when faced with a convincing national security argument, we agreed not to publish at that time.
"We also continued reporting, and in the ensuing months two things happened that changed our thinking.
"First, we developed a fuller picture of the concerns and misgivings that had been expressed during the life of the program.
"It is not our place to pass judgment on the legal or civil liberties questions involved in such a program, but it became clear those questions loomed larger within the government than we had previously understood.
"Second, in the course of subsequent reporting we satisfied ourselves that we could write about this program -- withholding a number of technical details -- in a way that would not expose any intelligence-gathering methods or capabilities that are not already on the public record.
"The fact that the government eavesdrops on those suspected of terrorist connections is well-known. The fact that the NSA can legally monitor communications within the United States with a warrant from the Foreign Intelligence Surveillance Court is also public information.
"What is new is that the NSA has for the past three years had the authority to eavesdrop on Americans and others inside the United States without a warrant.
"It is that expansion of authority -- not the need for a robust anti-terror intelligence operation -- that prompted debate within the government, and that is the subject of the article."
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