Under a court order, those historical calling records at the NSA are now off-limits to agents running the FBI terrorism investigation even with a warrant.
Instead, under the new USA Freedom Act, authorities were able to obtain roughly two years' worth of calling records directly from the phone companies of the married couple blamed in the attack.
FBI Director James Comey declined to say Friday whether the NSA program's shutdown affected the government's terrorism investigation in California.
"I won't answer, because we don't talk about the investigative techniques we use," Comey said. "I'm not going to characterise it."
White House spokesman Josh Earnest said the FBI was poring through records for the married couple: "This includes things like their foreign travel, their contacts with other individuals, their use of social media," he said. "There are some details of that investigation starting to dribble out, sometimes in garbled form."
The government kept five years' worth of each person's phone records, deleting older ones on a rolling basis. NSA contractor Edward Snowden revealed the program's existence in summer 2013.
"After November 28, 2015, no access to the BR (business record) metadata (phone records) will be permitted for intelligence analysis purposes," US District Judge Michael W. Mosman of Portland ruled. "Hence, queries of the BR metadata for the purpose of obtaining foreign intelligence information will no longer be permitted.
