These nione justices did not so rule. Such rulings as have been handed down as in 1898 do not address the issue. The Constitution gives Congress plenary power to decide on citizenship with no input or correction from the Court or the President. The 14th excludes Indians from citizenship even though they are born in the geographic USA because their parents owe allegiance to a foreign power i.e the tribes with treaties between themselves as sovereign nations and the United States. That pretty much describes the current “birthright” issue and negates it.
Not according to SCOTUS. In City of Boerne v. Flores (1997), the Court ruled that Congress's enforcement power only means that Congress can enforce the 14A as interpreted by SCOTUS.