The Department of Homeland Security (DHS) is terminating parole protections for those who entered the country through the CBP One app, revoking status for hundreds of thousands of people who came to the U.S. under the Biden administration.

Roughly 985,000 people used the app to make appointments at a port of entry at the border, with those who entered often permitted to seek asylum and given temporary work authorization.

“The Biden Administration abused the parole authority to allow millions of illegal aliens into the U.S. which further fueled the worst border crisis in U.S. history. Under federal law, Secretary [Kristi] Noem in support of the President has full authority to revoke parole. Canceling these paroles is a promise kept to the American people to secure our borders and protect national security,” the DHS said in a statement.

The administration has begun sending email notices to affected migrants telling them to self-deport through the Trump administration’s version of the app, now called CBP Home.

Those who entered the country as part of the Uniting for Ukraine program and Afghans who entered under Operation Allies Welcome are not impacted. 

DHS previously revoked parole for Cubans, Haitians, Nicaraguans and Venezuelans, who had also sought parole through the CBP One app, so long as they could also secure a U.S.-based financial sponsor. The more than 500,000 people affected by that revocation will lose their status on April 24.

President Trump suspended the app on his first day in office, leaving thousands at the U.S.-Mexico border who had appointments stretching into February.

Updated at 10:14 a.m. EDT