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Let us stick to documented facts.
FACT: According to those who framed our Constitution and helped to ratify it, the wording in the Fourteenth Amendment “… and subject to the jurisdiction thereof …” is a qualifier which, by documented legislative intent, excludes from the privilege of United States citizenship the offspring of illegal entrant foreign nationals born on American soil.
SOURCE
FACT: Congress has not exercised its Fourteenth Amendment, Section 5, authority to adopt appropriate legislation granting citizenship to the offspring of illegal entrant foreign nationals born on American soil.
FACT: “Without the enforcement clause, the provisions of the Fourteenth Amendment would be moot. This clause gives Congress the power to pass legislation with the goal of enforcing the Amendment. As a result, Congress has used this clause to ensure all Americans enjoy the rights outlined in the Fourteenth Amendment.”
SOURCE
FACT: In 1924, Congress exercised its authority and adopted appropriate legislation involving Indians, who were then subject to a foreign power, extending United States birth right citizenship by the
Indian Citizenship Act of 1924
FACT: To date there is no Supreme Court case which took up the question and confirmed a child born on American soil to an illegal entrant foreign national is granted U.S. citizenship upon birth.
FACT: Considering there is no federal statute, nor a Supreme Court case confirming a child born on American soil to an illegal entrant foreign national is a U.S. citizenship upon birth, it is mere current unwritten policy which does so.
FACT: The good news is, Trump can change current federal unwritten policy with a stroke of his pen.