Congressional leaders have begun to discuss legislation that would sharply increase the number of high-skilled foreign workers who could become permanent U. S. residents in the next few years. While it's sure to be controversial, the measure, if it passes, could mean more than 100,000 additional green cards would become available for skilled workers, perhaps even doubling the 140,000 that are allotted each year. "There are some discussions going on informally," says Representative Zoe Lofgren (D-Calif.), who chairs the House subcommittee on immigration.