US President Donald Trump declared a national emergency at the US-Mexico border, and he plans to send his troops to help support immigration agents and restrict access to refugees and asylum seekers.

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.

On his first day in office, President Trump shut down the CBP One mobile application that facilitated the legal entry of migrants into the U.S. at certain ports of entry. Why it matters: Thousands of people are left stranded in Mexico,

Donald Trump, after being sworn in as the 47th president of the United States, announced the termination of the CBP One app, a Biden-era border app that facilitated legal entry for nearly 1 million migrants through online appointments.

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