More than a million migrants who were allowed to enter the United States during the Biden administration may have their temporary stays revoked and be rapidly deported, according to an Immigration and Customs Enforcement document that became public Friday.

This will revoke legal entry for over 530,000 and initiate deportation for those without additional immigration benefits.

Many of the migrants under threat spent months waiting in Mexico, at migrant shelters or in rented rooms, in cities that are rife with cartel violence and kidnappings, in order to enter the US with permission.

The Trump administration is preparing to revoke legal status for many migrants who entered the United States under a Biden-era program, according to a source familiar with the planning, expanding the pool of people who could be deported.