The CBP One app was set up under the Biden administration to create an orderly way for migrants to enter the U.S. and to reduce illegal border crossings.

"The first 100 days are going to be the most aggressive, change oriented policy proposals and procedures that we've ever seen," KOAT political expert Brian Sanderoff said.

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.

Several migrants in Ciudad Juarez, Mexico, near the U.S. border cried in frustration as their CBP One app appointments were canceled after Donald Trump took office. Venezuelan migrant Jhony Flores says it felt unfair that an opportunity for legal passage was taken away after people spent so much time waiting in Mexico.

President Trump shut down the CBP One app, ending one of the pathways for asylum-seekers to gain legal entry into the United States.