It's tomato season and Lidia is harvesting on farms in California's Central Valley.

She is also anxious. Attention from U.S. Immigration and Customs Enforcement could upend her life more than 23 years after she illegally crossed the U.S.-Mexico border as a teenager.

"The worry is they'll pull you over when you're driving and ask for your papers," said Lidia, who spoke on condition that only her first name be used. "We need to work. We need to feed our families and pay our rent."

Experts say President Trump's stepped-up immigration policies are impacting the nation's labor force.

More than 1.2 million immigrants disappeared from the labor force from January through the end of July, according to preliminary Census Bureau data analyzed by the Pew Research Center. That includes people who

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