But the government said that despite recent leaks by Edward J. Snowden, the former N.S.A. contractor, that made public a fuller scope of the surveillance and data collection programs put in place after the Sept. 11 attacks, sensitive secrets remained at risk in any courtroom discussion of their details — like whether the plaintiffs were targets of intelligence collection or whether particular telecommunications providers like AT&T and Verizon had helped the agency.

“Disclosure of this still-classified information regarding the scope and operational details of N.S.A. intelligence activities implicated by plaintiffs’ allegations could be expected to cause extremely grave damage to the national security of the United States,” wrote the director of national intelligence, James R. Clapper Jr.

So, he said, he was continuing to assert the state secrets privilege, which allows the government to seek to block information from being used in court even if that means the case must be dismissed. The Justice Department wants the judge to dismiss the matter without ruling on whether the programs violated the First or Fourth Amendment.