As countless asylum hearing appointments were canceled Monday, those who had already trekked across the McAllen-Hidalgo International Bridge on the day Trump was inaugurated underwent three-hours of processing before making their their way to shelters and other temporary housing.

Migrants in Mexico who were hoping to come to the U.S. are adjusting to a new and uncertain reality after President Donald Trump began cracking down on border security.

President Donald Trump on Monday officially shut down the Customs and Border Protection-run app designed to help schedule appointments for people seeking eligibility for asylum, closing off a pathway for migrants at the Southern border hoping to enter the United States.

Victoria Meijia Garcia, 31, opened the CBP One app at 10 a.m. Monday as she did every day for the past several months, seeking an available appointment with an asylum official. But today, the top of the familiar homepage blared a message that filled her with dismay.

Just as Donald Trump's inauguration concluded, Honduran asylum seeker Denia Mendez's phone buzzed with alarming news: the CBP One app, her lifeline to a new life in the US, was down.

The CBP One app has been wildly popular. It is an online lottery system to give appointments to 1,450 people a day at eight border crossings.

CBP One, a border app that has allowed nearly 1 million people to legally enter the United States with eligibility to work, was abruptly shut down on Monday, shortly after President-elect Donald Trump took office.

On the day of President Donald Trump's inauguration, the government application CBP One, which migrants used to submit a legal visa application, ceased functioning. The CBP One application was introduced by Joe Biden's administration to reduce illegal crossings of the Mexico-US border.