Whether tariffs or mass deportations, no country has more to lose than Mexico under the Trump administration. Some 80% of the country’s exports go to its northern neighbor. Nearly four million of the estimated 11 million undocumented immigrants in the United States are Mexicans.

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.

The Mexican government is rushing to raise tent cities for migrants deported from the U.S. Thousands of non-Mexicans now stranded in the country are overwhelming immigration officials as migrants continue to arrive from Central and South America.