CIUDAD JUÁREZ, Mexico — A line of Mexican National Guard and Army trucks rumbled along the border separating Ciudad Juárez and El Paso, Texas, on Wednesday, among the first of 10,000 troops 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.