This means Texas has loyalty only to the Constitution, and when the federal government abandons the Constitution, Texas has no obligation, moral or legal, to recognize any government that has betrayed the law of the land (the Constitution and its Bill of Rights).
Also from the Texas Constitution:
All political power is inherent in the people … they have at all times the inalienable right to alter their government in such manner as they might think proper.
From the Texas Declaration of Independence:
When a government has ceased to protect the lives, liberty and property of the people, from whom its legitimate powers are derived…[it is] the inherent and inalienable right of the people to… abolish such government, and create another in its stead…
From the U.S. Declaration of Independence:
….governments derive their just powers from the consent of the governed…