Ahead of the inauguration, migrant shelters south of the Rio Grande are far from full, a reflection of the tougher measures imposed on both sides of the border.

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.

Data shows birthright citizenship hasn't changed much since 2000 as Trump wants to end it for children of illegal immigrants.

In Tijuana, meanwhile, Mexican soldiers are helping to prepare for the consequences of it. The authorities have readied an events centre called Flamingos with 1,800 beds for the returnees and troops bringing in supplies, setting up a kitchen and showers.

The Mexican government plans to establish nine reception areas for deportees in Mexico's six northern border states over the coming weeks.

Authorities said the tunnel is supported by wooden beams, equipped with electricity and has a ventilation system.

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.

Mexican authorities have begun constructing giant tent shelters in the city of Ciudad Juarez to prepare for a possible influx of Mexicans deported under U.S. President Donald Trump's promised mass deportations.

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.

The US-Mexico border is effectively closed off to migrants seeking asylum in the United States within hours of President Donald Trump taking office, an extraordinary departure from previous protocols that has left many concerned migrants in limbo.

EL PAÍS shares the stories of some of the thousands of migrants left stranded in Mexico after the Trump administration shut down the CBP One application