Hundreds of thousands of migrants lost scheduled appointments after CBP One app was disabled, creating uncertainty at the US-Mexico border.

Sprawling tents on the US border have been raised as Mexico braced for President Donald Trump to fulfill his pledge to carry out mass deportations.

The initial blow came with the end of CBP One, stranding thousands of asylum seekers with and without appointments

President Trump took action to close the nation’s southern border and terminate a widely used app. Many migrants expressed despair, and some moved to cross the border anyway.

President Donald Trump’s promise to deport “millions and millions” of immigrants will hinge on securing money for detention centers.

CBP One has been wildly popular, especially with Venezuelans, Cubans, Haitians and Mexicans. Now, they were stranded at the U.S. border or deeper in Mexico.

The president moved quickly to cancel the CBP One app, which allowed migrants to schedule appointments to gain entry into the United States, turning away potentially tens of thousands of migrants.

Migrant shelters in Tijuana — located across the border from San Diego, California — are bracing for a possible surge in the influx of migrants should US President Donald Trump carry out his mass deportation plan.

Mexico will give humanitarian aid to migrants from other countries whose asylum appointments were cancelled, as well as those sent to wait in her nation under the revived policy known as Remain in

Nidia Montenegro fled violence and poverty at home in Venezuela, survived a kidnapping as she traveled north into Mexico, and made it to the border city of Tijuana on Sunday for a U.S. asylum appointment that would finally reunite her with her son living in New York.

"I believe, especially in in our border, in Tijuana and San Diego will see a lot of suffering," said Professor Rafael Fernández de Castro.