reporter: a lot of people are upset about that. the migrant caravan is a big story as it continues to grow 4,000 people now and moving very slowly still deep in southern mexico as it makes its way to u.s. border weeks away and giving texas authorities to prepare a defense and we are starting to see how the defense is shaping out. the texas national guard humvees and soldiers now for the first time allowed to carry live rounds are employed as a deterrent. the guard members are able to make arrests of illegal immigrants caught while on private property. since march, the military and dps have made 150,000 apprehensions. in cepe county alone, 1100 arrests have led to trespass