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.

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.

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.

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.

The CBP One app, a government platform that the Biden administration used to admit more than 740,000 immigrants into the United States, was shuttered within moments of President Donald Trump taking office this afternoon.

Hours after Trump’s inauguration, his administration canceled appointments allowing migrants to enter the U.S. to request asylum, leaving many of them stranded on the U.S.-Mexico border.

CBP One was used by the Biden administration to allow hundreds of thousands of migrants into the country to pursue asylum claims.

Migrants who waited months to cross the U.S. border with Mexico learned their CBP One appointments had been canceled moments after Donald Trump was sworn in as president.

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.

President Donald Trump has lifted long-standing restrictions on migrant arrests at sensitive locations such as schools and churches, reversing policies set by ICE and CBP over the past decade.

"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 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.