A bill introduced in the U.S. Congress would double the number of immigrant worker visas available each year under the H-1B program, earning the legislation praise from Microsoft.

The Innovation Employment Act, introduced by Representative Gabrielle Giffords, an Arizona Democrat, late Thursday, would increase the cap in H-1B visas from 65,000 a year to 130,000 a year. In addition, there would be no cap on H-1B applications for foreign graduate students attending U.S. colleges and studying science, technology and related fields. Currently, there's a 20,000-a-year cap on visas for graduate students in all fields.

The legislation would increase the H-1B cap to 180,000 in the years 2010 to 2015 if the 130,000 cap is reached the year before.

Microsoft Chairman Bill Gates called for an increase in the H-1B visa cap while testifying before the House of Representatives Science and Technology Committee Wednesday. In recent years, the H-1B cap has been filled days -- or even the same day -- after the government opened the application period.

"We provide the world's best universities ... and the students are not allowed to stay and work in the country," Gates said Wednesday. "The fact is, [other countries'] smartest people want to come here and that's a huge advantage to us, and in a sense, we're turning them away."

Microsoft praised Giffords' bill. The legislation "would boost America's competitiveness by giving U.S. employers the flexibility they need to hire the best talent available to fill a severe shortage of qualified U.S. high-skilled workers," Jack Krumholtz, management director of federal government affairs for Microsoft, said in a statement. The bill would also increase U.S. jobs; Microsoft hires an additional four people to support each H-1B worker, Krumholtz said.

The U.S. government will begin accepting visa applications for next year in April, and Microsoft predicted the cap would be filled the same day, as it was in 2007. "The current system effectively prevents American companies from hiring this year's foreign-born university graduates," Krumholtz added.

The Giffords' bill would also increase penalties for H-1B fraud and allows the U.S. Department of Labor to reject H-1B applications for "clear indicators of fraud," in addition the current rule of rejecting only applications that are inaccurate or incomplete. The bill puts important safeguards on the H-1B program in place, said C.J. Karamargin, a spokesman for Giffords.

The bill would prohibit companies from hiring H-1B workers, then outsourcing them to other companies, he said. H-1B opponents have complained that outsourcing companies are among the top users of H-1B visas.