The governor writes:

The federal government has broken the compact between the United States and the States. The Executive Branch of the United States has a constitutional duty to enforce federal laws protecting States, including immigration laws on the books right now. President Biden has refused to enforce those laws and has even violated them. The result is that he has smashed records for illegal immigration.

Despite having been put on notice in a series of letters - one of which I delivered to him by hand - President Biden has ignored Texas's demand that he perform his constitutional duties. //

The failure of the Biden Administration to fulfill the duties imposed by Article IV, § 4 has triggered Article I, § 10, Clause 3, which reserves to this State the right of self-defense. For these reasons, I have already declared an invasion under Article I, § 10, Clause 3 to invoke Texas's constitutional authority to defend and protect itself. That authority is the supreme law of the land and supersedes any federal statutes to the contrary. The Texas National Guard, the Texas Department of Public Safety, and other Texas personnel are acting on that authority, as well as state law, to secure the Texas border. //

In the Constitution, Article I, § 10, Clause 3 states:

No State shall, without the Consent of Congress, lay any Duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War, unless actually invaded, or in such imminent Danger as will not admit of delay.