Tenth Amendment of The United States Constitution:

The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

The States of the southern border have the lawful power and right to construct the wall with or without support of the federal government.

Tenth Amendment of The United States Constitution:

The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

The States of the southern border have lawful power and right to construct the wall with or without support of the federal government.