A federal judge has struck a historic blow to the National Security Agency’s bulk collection of phone records. On Monday, U.S. District Judge Richard Leon ruled the NSA program “almost certainly” violates the Fourth Amendment of the Constitution. Judge Leon, who was appointed by former President George W. Bush, wrote, “I cannot imagine a more 'indiscriminate' and 'arbitrary invasion' than this systematic and high-tech collection and retention of personal data on virtually every single citizen.” But Judge Leon stayed his injunction pending an expected appeal by the Obama administration.