bipartisan group u.s. lawmakers unveil legislation wednesday would overhaul aspects national security agency warrantless internet surveillance program effort install additional privacy protections bill formally introduce soon thursday likely revive debate washington balance security privacy amid concern among lawmakers party u.s. government may eager spy citizens legislation write house representatives judiciary committee see civil liberties group best chance congress reform law know section 702 foreign intelligence surveillance act expiration dec. 31. senior u.s. intelligence officials consider section 702 among vital tool thwart threats national security american ally allow u.s. intelligence agencies eavesdrop store vast amount digital communications foreign suspect live outside unite state program classify detail expose 2013 former nsa contractor edward snowden also incidentally scoop communications americans include communicate foreign target live overseas communications subject search without warrant federal bureau investigation discussion draft legislation copy see reuters partially restrict fbi ability access american data collect section 702 require agency obtain warrant seek evidence crime limit would apply however request data involve counterterrorism counter-espionage narrow restriction call backdoor search loophole disappoint civil liberties group several organizations send letter week say would support legislation require warrant query american data collect section 702. legislation would also renew program six years codify national security agency decision early year halt collection communications merely mention foreign intelligence target codification would end six years well mean nsa could potentially resume activity 2023. spy agency say lose operational capability end so-called collection due privacy compliance issue lobby law would make termination permanent republican senators introduce bill early year renew section 702 without change make permanent position back white house intelligence agencies effort expect face major resistance house influential conservative bloc republicans early year say oppose renewal unless major change make reflect disagreement within majority party separately senators john cornyn republican chamber democratic senator dianne feinstein work section 702 legislation may also introduce week include few reform democratic senator ron wyden republican senator rand paul also plan introduce bill would require warrant query section 702 involve data belong american u.s. lawmakers want restrict internet surveillance americans