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.

In a show of force aimed at quickly increasing arrests and generating publicity, the administration targeted the nation’s largest city, where sanctuary policies limit official cooperation with ICE.