Next week, Microsoft Chairman Bill Gates will testify before the House Committee on Science and Technology at a hearing "on the future of innovation and U.S. competitiveness," at which he likely will renew his appeal that more foreign workers be allowed into the country.

The topic of the hearing is familiar ground for Gates on Capitol Hill. But what makes his scheduled appearance on March 12 potentially explosive is its timing, less than three weeks before the start of the annual application rush for H-1B visas.

April 1 is the first day that U.S. immigration authorities will begin accepting H-1B applications for the federal government's 2009 federal fiscal year, which begins in October. Last year, the government stopped taking applications after receiving about 150,000 in a single day ? far more than enough to exhaust the annual cap of 65,000 regular visas and 20,000 set aside for foreign nationals who have advanced degrees from U.S. universities.

Last month, Gates called the H-1B program "a disaster" in response to a question about immigration during a talk that he gave at the University of Waterloo in Ontario. "If I could just change one law in the U.S. it would be this," Gates said. An excerpt featuring that comment has been posted on YouTube, and a video of the full speech can be viewed on the university's Web site .

Gates testified last March before the Senate Committee on Health, Education, Labor and Pensions, warning that the U.S. was risking its global leadership role because of insufficient investments in research and education as well as the problems that companies faced in hiring foreign workers.

In his written testimony, Gates predicted ? accurately ? that for the first time in the history of the H-1B program, the supply of visas would run out before students graduating from college received their degrees. "This means that U.S. employers will not be able to get H-1B visas for an entire crop of U.S. graduates," he wrote. "We are essentially asking top talent to leave the U.S."

It remains to be seen how well Gates' message on immigration will play this year, amid slowing economic growth and rising unemployment.

But Robert Hoffman, an Oracle Corp. executive who is co-chair of Compete America , a Washington-based group that lobbies for immigration reform, said that the demand for H-1B workers among U.S. companies continues unabated. "The expectation is that you are going to see an even bigger flood of applications than what we saw last year," he said.

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