People from Haiti, Nicaragua, Cuba and Venezuela who had temporary permission to stay in the country are receiving emails telling them to go.
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US orders 500,000 citizens of four countries to leave
Hundreds of thousands of immigrants who were given special permission to come to the US will be told that they must leave the country immediately.
The Department of Homeland Security (DHS) said in a statement Thursday that Cubans, Haitians, Nicaraguans, and Venezuelans who were previously temporarily shielded from deportation will be emailed notices telling them to go.
The DHS said that more than half a million people from the four countries were allowed to remain in the US for two years under orders issued by former President Joe Biden.
The directive is expected to face legal challenges from opponents of the Trump administration's mass deportation programme.