Birthright citizenship guarantees U.S. citizenship to almost all babies born on U.S. soil, with the children of diplomats the primary exception.

FORBES: Ending Birthright Citizenship Would Be Costly for Americans

Such a change would not reduce illegal immigration, since there is little evidence the primary motivation of illegal immigrants coming here is to give birth on U.S. soil, as opposed to jobs.

FORBES: Ending Birthright Citizenship Would Be Costly for Americans