Philadelphia Police , to file lawsuits over surveillance . Civil liberties advocates say the measures are unacceptable intrusions . Court complaints over NSA surveillance records . Legal challenges continue to be uphill fight in federal courts . President Barack Obama says surveillance necessary and lawful to fight terror .
Philadelphia Police , to file lawsuits over surveillance . Court complaints over NSA surveillance records . Legal challenges continue to be uphill fight in federal courts . President Barack Obama says surveillance necessary and lawful to fight terror .