Texas Gov. Greg Abbott deployed the troops to the Rio Grande Valley, where he said they'll work side-by-side with U.S. Border Patrol agents to keep migrants from illegally entering the country. Some of those troops left from the U.S. Naval Air Station Joint Reserve Base in Fort Worth Monday morning. The others left from a base in Houston.

A line of Mexican National Guard and Army trucks rumbled along the border separating Ciudad Juárez and El Paso, Texas.

The Pentagon will deploy roughly 1,500 more active duty soldiers to the southern border to support President Donald Trump’s expanding crackdown on immigration