We are not talking about the foreign born.
I was referring to the 14th Amendment to the US Constitution, which bestows citizenship on anyone born in America.
One can build a wall without even an act of Congress. A state could build a wall if it wanted to. But one cannot strip babies born in the US of citizenship without amending the Constitution: 2/3rds of Congress and 3/4ths of the States have to agree. (They won't.)
"I was referring to the 14th Amendment to the US Constitution, which bestows citizenship on anyone born in America."
The drafters of the 14th amendment during congressional deliberations on the amendment EXPLICITLY said that the 14th Amendment does not grant citizenship simply because you are in the borders of the United States.
The word "subject to the jurisdiction" was meant to allow Congress, NOT the Courts, to define who is under American jurisdiction by appropriate Congressional statutes.
The Congress can actually pass a statute defining "jurisdiction" as a child born to parent/parents who are lawfully present within the United States. Also, the Congress can make this law unreviewable by any Federal Court, including SCOTUS as per Congress' powers under Article III Section II of the Constitution. Even if that law is unconstitutional, SCOTUS can't review it.
If someone doesn't like a law banning anchor babies from citizenship, the people can go to the ballot box and vote in Congressman willing to restore birthright citizenship.