Sept. 1 (UPI) -- New government data is outlining how President Donald Trump's U.S. immigration crackdown is impacting the job market.

The number of U.S.-based migrant workers, data released August 21 by the Washington-based think tank Pew says, declined by 1.2 million from January through July, according to Pew-analyzed data out of the U.S Census Bureau in figures including non-legal and legal residents.

"It's unclear how much of the decline we've seen since January is due to voluntary departures to pursue other opportunities or avoid deportation, removals, underreporting or other technical issues," Stephanie Kramer, a Pew senior researcher, told CBS News.

Pew said from 2021 to 2023 there was a 13% bump in migrants via South America.

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