More than 400 additional Texas National Guard troops arrived at the Texas-Mexico border on Monday. Texas Gov. Greg Abbott deployed the troops to the Rio Grande Valley, where he said they'll work side-by-side with U.

Texas Governor Abbott mobilizes the Tactical Border Force to reinforce security along the Texas-Mexico border in collaboration with federal authorities.

Texas Gov. Greg Abbott is sending aircraft, helicopters and 400 specially trained National Guard soldiers to assist the Border Patrol.