A top White House official told House lawmakers this week that the replacement of U.S. workers by H-1B visa holders is troubling and not supposed to happen. But it is hard to tell whether the administration will do anything about it. The signals are mixed.

Several federal agencies, at the request of lawmakers, are investigating complaints by IT workers at Southern California Edison, Disney Parks and Resorts and some other firms, that they had to train H-1B workers prior to their layoff.

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