From Texas Standard:
The surge in immigrant children has prompted Gov. Greg Abbott to extend National Guard deployments at the Texas border. Paul Weber, a reporter covering the story for the Associated Press, says while the exact number of troops is unknown, it’s probably in the low hundreds.
“In December of 2014 when Gov. Perry first deployed the National Guard to the border, he sent up to 1,000 troops,” Weber says. “But as recently as February, state officials said that there's now only about 200 troops there. And that was in anticipation of an expected drawdown to eventually get the troops out of there.”