Article IV, §4, U.S. Constitution, requires The United States to protect each of the States against Invasion. It says:
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion… [emphasis added]
In Federalist No. 43 (3rd para under 6.), James Madison says of this provision:
A protection against invasion is due from every society to the parts composing it…
Article I, §8, clause 15 grants to Congress the power to provide for calling forth the Militia to [among other things] “repel Invasions”.
But the federal government has persistently refused to call forth the Militia to protect the States on our Southern Border from Invasion!
So! What are States to do when their Lands are invaded, their citizens murdered and kidnapped, their young corrupted by drug-trafficking invaders, and their budgets imploded from unconstitutional federal mandates that we subsidize the invaders? Are the States to sit with folded hands and be destroyed because the federal government refuses to perform its constitutional duty? No!
We are Americans! If the federal government refuses to perform its constitutional duty to call out the Militia to protect the States against Invasion, then the States must perform that Duty. And as shown below, they have both an implied and an expressly retained authority to do so.
Article 1, §8, clause 16 grants to Congress the power to provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States. This clause reserves to the States the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress.