The Trump administration Monday ended use of a border app called CBP One that has allowed nearly 1 million people to legally enter the United States with eligibility to work.

Supporters say CBP One has helped bring order to the border and reduced illegal crossings. But Trump has said he would end it as part of a broader immigration crackdown. Critics say it prioritizes a lottery system over people who have long lived in the U.S. illegally while paying taxes and people who have waited years for visas.