The Supreme Court on Friday agreed to take up one of President Donald Trump's most contentious policies by reviewing the American legal principle of "birthright citizenship," potentially upending a 127-year-old understanding of who gets to be a U.S. citizen.

The Trump administration argues that citizenship has been too freely granted to the offspring of non-citizens. On his first day back in office, Trump signed an executive order withholding citizenship from children born to non-citizens "unlawfully present" in the U.S., or non-citizens in the country on a temporary basis, such as tourists. The order would apply only to people born 30 days after the order was signed Jan. 20.

Four federal courts and two appeals courts have blocked implementation of the executive order. Courts cite th

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