Mexico was raising sprawling tents on the U.S. border Wednesday as it braced for President Donald Trump to fulfill his pledge to reverse mass migration.

President Donald Trump's promises of mass deportations, which could bring batches of new arrivals fresh off the border bridges into Juárez, has Mexican law enforcement preparing to keep watch for potential trouble.

Mexico Embraces You” initiative will accept Mexican nationals deported from the U.S. at tent camps, while deportees from other nationalities will be transferred to the city’s largest shelter.

Four tents are being erected in what’s known as El Punto in Ciudad Juárez across the border from El Paso to temporarily house Mexican migrants deported from the U.S. under the Trump administration.

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.

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

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.

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

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.

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.