That language in the 14th Amendment requires no renunciation of allegiance to the other country. So if Marco’s parents were in the country legally, they are subject to the jurisdiction of the United States. An Ambassador from another country, ore anyone with diplomatic immunity, for example, would not be subject to the jurisdiction of the US. An the Congress can easily extend that to illegal invaders as well.
However, if the Supreme Court rules on this and says you have to be born on American soil of American parents, I am OK with that. It eliminates Ted and Marco, but that is OK. We still have Trump, Carson, Bush, Christy, Paul, Kasich, Fiorino, Huckabee, and Santorum to pick from.
Again, if that is the rule, then we are saying that a house guest can claim adoption into your family, based solely on their presence in your home.
And if the Supreme Court so rules, they will be once again ruling against the laws of nature, and the Constitution.
A ruling that should then be ignored, being null and void.