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

Maria Mercado, who is from Colombia but arrived from Ecuador, gets emotional as she sees that her 1pm appointment was canceled on the U.S. Customs and Border Protection (CBP) One app, as she and her family wait at the border crossing in Tijuana, Mexico on Monday, Jan. 20. 2025. (AP Photo/Gregory Bull)

WASHINGTON (AP) — President Donald Trump’s promises to beef up security at the southern border with Mexico began taking effect soon after he was inaugurated Monday, making good on his defining political promise to crack down on immigration and marking another wild swing in White House policy on the divisive issue.

A wide-ranging series of steps President Donald Trump has promised to beef up security at the southern border is beginning to take effect.

The CBP One app went offline as President Donald Trump returned to power. The move is likely a precursor to Trump's immigration policies.

Migrants waiting to enter the United States via its southern border are in distress following U.S. President Donald Trump's sweeping decision to suspend asylum claims after returning to the White House.

Donald Trump won the election largely on the promise of cracking down on border crossings. When he takes office next week, he will be inheriting a quiet border, with crossings plummeting for the past few months.

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.

Workers handled beef in Avellaneda in the province of Buenos Aires, Argentina. People cooled off in Arpoador beach in Rio de Janeiro.

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

El primer golpe llegó con el fin de CBP One, dejando varados a miles de solicitantes de asilo con y sin citas.

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.