I think that is the major problem, Texas does not want to pay for the activated Guard salaries knowing that they will not be paid back. Also, there would be a command crisis if Obama ordered them to stand-down. I don’t think Perry wants to go that far. Still, he could call up the State Guard or Sheriff’s posses to police the border.
The Texas State Guard would be pretty much useless.
At least if 0bama ordered the NG to stand down, he would show his true colors. His approval ratings are already in the tank, and if he pulled such a stunt, they’d drop to near zero.
Maybe the congress critters wouldn’t be so timid to impeach a president nobody seems to like anyway.