Why does everything have to be a federal issue. These are state legislators. Let the state of Texas handle it.
Huge question, that. Broadly speaking, the left has, for the last century at least, pursued control of the federal government while attempting to expand its powers for one reason: that's the biggest lever of power in the country. It's the reason issues "reserved to the States" have been essentially co-opted by the federals - it's a nice tidy route to authoritarian government.
This has foundered, ironically, on the "sanctuary" movement among states that insist on continuing their support of illegal immigration over (rightful) federal intervention - it ended up bringing states' rights back to the fore. Those states that countered with sanctuary movements with respect to the 2nd Amendment and their own border control have solidified that as a central question in American government once again. It's been an issue since 1787 and it hasn't gone away.
To return such considerations into the hands of the states may well be the single overweening theme in the politics of the 20's, especially now that the federal front-end, illegitimate president and incompetent vice-president, have proven so incredibly weak. I'm guessing that's the new battleground. And the oldest one.