Why Trump's latest speech is a big deal for Silicon Valley

President Donald Trump was in Wisconsin on Tuesday, but his words probably resonated most in California. 
He announced a plan to overhaul an American visa program that brings tens of thousands of workers and students to the United States every year, many of whom find work in tech-related jobs in Silicon Valley.
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"American workers have long called for reforms to end these visa abuses," Trump said. "They should