President Clinton and NSA head Livingstone assure the nation that data mining is only being used against terrorists. "Everything the NSA does is legal." Livingstone told the fawning nation. President Clinton and NSA head Livingstone assure the nation that data mining is only being used against terrorists. "Everything the NSA does is legal." Livingstone told the fawning nation.Hee hee. If you can't trust Livingstone, well, who can you trust?