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 said the additional troops will work alongside federal border agents amid the Trump administration's crackdown on immigrants.