In a case involving changes to birthright citizenship, the justices heard arguments on whether a single federal judge in a single district can block Trump administration policy across the country.

Supreme Court Justice Clarence Thomas made perhaps the most important point of the day during oral arguments Thursday in a case involving federal district judges' power to issue nationwide injunctions.

The Supreme Court on Thursday seemed open to lifting a series of nationwide orders blocking President Donald Trump from enforcing his birthright citizenship policy even as several of the justices wrestled with the practical implications of allowing the government to deny citizenship to people born in the US.