According to an annual transparency report released Friday, the spy agency collected 534 million call records in 2017, more than three times the 151 million collected in 2016. The new statistics were first reported by Reuters.
The report, released Friday by the Office of the Director of National Intelligence, is mandated by the USA Freedom Act passed by Congress in 2015 that aimed to restrict and boost oversight of the spy agency's surveillance program.
The NSA's surveillance powers have weathered scrutiny since the 2013 Edward Snowden revelations that exposed the agency's now-defunct bulk collection program. Under the old program, the NSA is estimated to have gathered billions of phone records.