A line of Mexican National Guard and Army trucks rumbled along the border separating Ciudad Juárez and El Paso, Texas Wednesday, among the first of 10,000 officers Mexico has sent to its northern frontier following tariff threats by President Donald Trump.

President Claudia Sheinbaum’s government said the National Guard members had redeployed to 18 cities and towns along the U.S.-Mexico border as part of a deal to delay U.S. tariffs.

Texas National Guard soldiers now have the authority to make immigration arrests and help detain and deport undocumented people under an agreement between the state and the Trump administration that requires those duties be done under the supervision and direction of a U.S. Customs and Border Protection official.