What does the Supreme Court do? How does that differ to the original intentions of the Framers in 1787? ‘Origins’ looks at the beginnings of the Supreme Court to see if this helps with understanding how it operates today. From the beginning, the Court has filled in the blanks contained in Article III by defining its own power. Article III announced a national court with the authority to decide cases ‘arising under’ the country's Constitution. This is quite vague. The role of the Supreme Court has been a matter of dispute ever since. How has the modern Court come to be able to exercise its great power?