Well see this gets at the heart of the problem with the challenge going on re: birthright citizenship. It's not just that it's being challenged, but rather the power the SC would be assuming in facilitating the challenge. It's one thing when the language of the Constitution is vague; that's why we have an SC. But birthright citizenship is crystal clear. In order to change it, they have to invent or imagine new language that doesn't exist. It would be the SC -in essence- taking the power to change the plain text of the constitution.