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.

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.

Nationwide injunctions have become more prevalent over the past 20 years, with lawyers "forum shopping" for judges friendly to their cause. The Supreme Court Thursday heard a case about whether to limit their scope.