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,

In a move fulfilling one of now-President Donald Trump’s campaign promises, the Trump administration shuttered the use of CBP One, a President Joe Biden-era app meant to help process migrants seeking to apply for asylum in the U.S.