Supreme Court limits nationwide injunctions in birthright citizenship order. The Supreme Court in a 6-3 decision along ideological lines on Friday sided with the Trump administration's request to limit universal injunctions issued by federal courts. The opinion in the birthright citizenship case was highly anticipated.

SCOTUS's CASA Decision Ends Nationwide Injunctions, Creating Uncertainty Around Enforcement of Executive and Agency Actions. The SCOTUS opinion ends district courts' ability to issue nationwide injunctions.

The Supreme Court stated that the rule was "ancient and fundamental", i.e., well-established common law, in 1898: "the Fourteenth Amendment affirms the ancient and fundamental rule of citizenship by birth within the territory, in the allegiance and under the protection of the country, including all children here born ...