The CBP One app has been highly popular, functioning as an online lottery system that grants appointments to 1,450 people daily at eight border crossings. These individuals enter the U.S. under immigration "parole," a presidential authority that Joe Biden has exercised more frequently than any other president since its creation in 1952.

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.

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. A notice on the website of Customs and Border Protection on Monday just after Trump was sworn in let users know that the app that had been used to allow migrants to schedule appointments at eight southwest border ports of entry is no longer available.

The CBP One app had gained significant popularity, operating as an online lottery system that allocated appointments to 1,450 people daily.

Trump administration officials minutes after the new president took office on Monday shut down a mobile app for migrants to make appointments at the U.S.-Mexico border. By shutting down the CBP One app,