On Sunday, thousands of migrants on foot departed Mexico’s southern border in the hope of reaching the border with the United States, representing about a dozen different countries.

A few of the group members expressed their hope to reach the U.S. border ahead of the November elections, citing worry that Donald Trump, should he win, would carry out his threat of closing the border to refugee seekers.

The possibility of having our licenses (to cross the border) denied exists, according to El Salvadorian immigrant Miguel Salazar. He was concerned that the Trump government may cease scheduling appointments for migrants via the CBP One app, which allows asylum applicants to lawfully enter the country by securing appointments at border crossings.

When migrants get to Mexico City or the northern Mexican states, the app will not function.

Salazar, 37, stated, “Anyone wishes to go down that route.”

The city of Ciudad Hidalgo, which is located on a river that separates Mexico from Guatemala, is in the country’s south. On Sunday, the group departed.

Some claimed they were waiting for permission to travel to communities further north for weeks while they were in Ciudad Hidalgo.

In an attempt to lessen the likelihood of being assaulted by gangs or suspended by Mexican immigration officials while traveling, migrants have formed sizable groups in the past few years. However, in southern Mexico, the caravans usually collapse because the walkers grow exhausted after covering dozens of miles.

In recent years, Mexico has made it more challenging for migrants to travel by train and bus to the border with the United States.

Hundreds of migrants are being stopped by immigration officials at crossings in the northern and southern regions of Mexico and driven back to communities far in the country’s south. Departure passes are rarely granted to migrants who reach the country without visas.

A 55-year-old Cuban immigrant named Oswaldo Reyna entered Mexico 45 days earlier from Guatemala and was waiting in Ciudad Hidalgo to be part of the newly mentioned procession on social media.

He took issue with Trump’s recent remarks against immigrants and their attempts to “invade” the country.

He declared, “We are not criminals.” “We are diligent people who emigrated from our homeland to pursue better opportunities because there are so many unfulfilled needs there.”