Democratic and Republican leaders in the Senate have reached a deal with the Bush administration that would grant retroactive immunity to major telecommunications firms that have aided the spying on U.S. citizens without court warrants. The measure would wipe out a series of pending lawsuits against the companies for alleged violations of privacy rights. Senate Democrats won a requirement that would allow the Foreign Intelligence Surveillance Court to review the government’s procedures for deciding who is to be the subject of warrantless spying. The measure would also face renewal every six years, instead of being made permanent. The agreement came as House Democrats pulled their version of the surveillance bill under threat of a Republican-led defeat.