The concept of jus soli is absurd on its face-which is why most Americans oppose it when it's explained to them, and why most of the planet rejects it.
Even though it contributes only a slight percentage to the number of immigrants in this country, it has horrible cascading policy effects that open borders advocates refuse to acknowledge.
This has been one of my primary arguments when discussing this issue over the years.
Jus Soli is stupid. It allows non-citizens to gift something they don't own to someone else without the voluntary consent of the people who do own it. US Citizens.
Immigration is like adoption. You get to be a member of a family if the family consents to adopt you, not because you happen to be born in their house.
Jus Soli is stupid. It serves the Interests of an Island King throwing servitude on anyone he can, but it does not suit the Interest of a prosperous Free Republic.