The Supreme Court is expected to decide one of the most consequential cases in modern US history on Friday - whether a single federal judge can block an order from the US president from taking effect nationwide.
The case stems from President Donald Trump's bid to end birthright citizenship, which has been frozen by multiple lower courts.
The Supreme Court is not likely to rule on the constitutionality of birthright citizenship itself. It will instead focus on federal judges' use of nationwide injunctions, which have stunted key aspects of Trump's agenda.
The Trump administration has argued that the judges have overstepped their power, but others say the injunctions are needed to avoid "chaos".
On his first day back in office, Trump signed an executive order aimed at ending automatic citizenship rights for nearly anyone born on US territory - commonly known as "birthright citizenship".
