Trump ended use of a border app to allow migrants to enter the country on two-year permits with eligibility to work, canceling tens of thousands of appointments into early February for people stranded in Mexico. Nearly 1 million people entered the U.S. at land crossings with Mexico by using the CBP One app.

The administration has mobilized military units to head to the southern border and increased immigration raids in major cities. Here's what to know.

As the Trump administration intensifies its crackdown on immigrants who are in the country illegally, officials and agencies took to social media to publicize the arrests.