As parades and other events celebrating the contributions of workers in the U.S. are held Monday for the Labor Day holiday, experts say President Donald 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 are in the country illegally as well as legal residents.

Immigrants make up almost 20% of the U.S. workforce and that data shows 45% of workers in farming, fishing and forestry are immigrants, according to Pew senior researcher Stephanie Kramer. About 30% of all construction workers are immigrants and 24% of service workers are immigrants, she added.

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