The U.S. Supreme Court is returning from recess nearly a month early to hear arguments in a case that could drastically alter how political campaigns are funded.

The court Wednesday hears arguments on whether to overturn restrictions on how and when corporations and labor unions can take part in political campaigns.

The case stems from a documentary called Hillary: The Movie, a highly critical look at Hillary Clinton in her bid for the presidency last year.  The court is revisiting the case after hearing arguments about the documentary in March.

The dispute centers on whether the documentary is the equivalent of a political advertisement and subject to regulation by federal campaign finance laws.  A conservative group called Citizens United produced the 90-minute film about Clinton, a former first lady and then-U.S. senator.  She is now U.S. secretary of state.

Wednesday will also be the debut of the newest Supreme Court justice, Sonia Sotomayor, the first Hispanic and only the third woman to sit on the high court.

Some information for this report was provided by AP.