Section 1. All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
Section 5. The Congress shall have power to enforce, by appropriate legislation, the provisions of this article.
Congress believed this to be the case. Otherwise they would not have acted.
While I, as many other Conservatives, through the years, have challenged the ratification of the 14th Amendment, your point has already been litigated, by Courts that accept its validity. Today's action by the Supreme Court, in not hearing the case, is not the first time they have chosen not to hear the case, which by implication lets the holdings of the lower Courts stand as the Law of the case.