WASHINGTON -- A bipartisan group of senators voted against adding a biometric system to the immigration reform bill on Tuesday. The amendment, proposed by Sen. Jeff Sessions, R-Ala., was one of the most controversial additions to the bill being considered by the Senate Judiciary Committee. It would have required the government to use fingerprints and other biometric data to track visitors on tourist, student and other temporary visas. Democrats argued that the system would be too expensive to implement. The amendment was voted down 6-12, with 10 Democrats and two Republicans, Lindsey Graham, R-S.C., and Jeff Flake, R-Ariz., opposing it.