The Supreme Court sounded unconvinced Wednesday that a president can unilaterally shrink one of the bedrock promises of the 14th Amendment. In a closely watched case on President Trump's order to restrict birthright citizenship, several justices from across the court's ideological spectrum pressed Solicitor General D. John Sauer on his claim that citizenship at birth should be limited to children of immigrants "domiciled" in the US, the Washington Post reports. The administration argues that children born here to parents without permanent legal status, or on temporary visas, should no longer be automatic citizens—a direct challenge to more than a century of practice.