As sovereign and independent nations voluntarily associating with other sovereign and independent nations in a Confederacy called the United States, which they delegated certain definite powers, and which they denied all other powers, the States have full rights to manage themselves however they choose, so long as they do not violate the explicit limits on their authority they spelled out in the Constitution. Each State has a right to judge for itself the constitutionality of any federal law, and reject it through nullification if it finds it unconstitutional, and has the right to secede from the Union whensoever it chooses. Texas thus has full rights to secure its own borders, and not only that, it has full rights to raise up a force of militia to force the Feds out of the State if they try to interfere.