It was not clear, however, whether Alexander had any immediate knowledge of the latest disclosure in the Post report. Instead, he appeared to speak more about the PRISM program and its legal parameters.
In a separate statement, NSA spokeswoman Vanee Vines said NSA has "multiple authorities" to accomplish its mission, and she said "the assertion that we collect vast quantities of U.S. persons' data from this type of collection is also not true." At no point did the NSA deny the existence of the MUSCULAR program.
The GCHQ had no comment on the matter.
The Post said the NSA was breaking into data centers worldwide. The NSA has far looser restrictions on what it can collect outside the United States on foreigners and would not need a court order to collected foreigners' communications.
Cybersecurity expert James Lewis said it is likely that the Google and Yahoo data was part of a larger collection of communications swept up by the NSA program from the fiber-optic pipeline. He said that while the collection was probably legal, because it was done overseas, the question is what the NSA did with the data linked to U.S. citizens.
To meet legal requirements, the NSA has to distinguish between foreign and U.S. persons, and must get additional authorization in order to view information linked to Americans, said Lewis, who is with the Center for Strategic and International Studies. He said it's not clear from the reports what the NSA did with the U.S. data, and so it's difficult to say whether the agency violated the law.
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