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.

President Trump has vowed to clamp down on immigration and undo Biden-era policies that he said were too permissive and blamed for allowing a large influx of undocumented immigrants. Here’s what we know about his policy changes.

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

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.

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.

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.

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 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.

During the inauguration of Donald Trump as the 47th President of the United States, the CBP One mobile application, a tool used by thousands of migrants to schedule appointments at the border, ceased to be operational.

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

The CBP One App, used by migrants to notify the U.S. government of their intention to arrive at a port of entry and provided resources, has been shut down by the Trump Administration.