The National Security Agency has secretly been buying Americans’ internet records and using them for spying purposes without obtaining a warrant, a senior senator revealed Thursday. He released a letter from Army General Paul M. Nakasone, director of the NSA, detailing and justifying the agency’s actions. They don’t include location data from phones “known to be used in the United States,” and they don’t buy or use location data from automobiles in the U.S. In that case, the FTC said the sale of location data is an intrusion into consumers’ lives. The senator previously revealed that the Defense Intelligence Agency was buying commercially available location data that included Americans.