California senators have released a statement condemning the Trump administration's intention to use federal Bureau of Prisons facilities to detain refugees and asylum-seekers.

The move, which could expose unregistered migrants to criminal prosecution, represents a drastic escalation of the administration’s efforts to push millions of immigrants to leave on their own.

The Trump administration is creating a registry for all people who are in the U.S. illegally, and those who don’t self-report could face fines or prosecution.