Last summer, the phone logs collection program was under the spotlight again, after it became clear that US carriers have supplied the NSA with bulk data it wasn't authorized to collect after post-Edward Snowden changes to the law. "We did not receive any content, geolocation data, or financial data," said the NSA spokesperson at the time, but the agency still took drastic measures and purged hundreds of millions of logs it had amassed since 2015.
Such technical hurdles to distinguish between "right" and "wrong" collection, and the failure to prove conclusively that the data has helped thwart any attacks on Ameican soil, may have contributed to the eventual NSA decision to shut the program entirely. According to the NSA's chief Gen. Paul Nakasone:
Good riddance, although privacy experts and activists are worried that the national security administration could simply opt to move the supervision of its bulk phone surveillance tactics under other laws and authorizations, so Congress must remain vigilant about the USA Freedom Act that currently controls it as it is set to expire mid-December.