Why is the Supreme Court job important in the United States?

Because the Supreme Court can check the president and Senate for a law to be passed to see if it constitutional also they are the highest form of court so if you want get something repelled or want a law passed or changes something you can argue your case up their

The Supreme Court is the final judge in all cases involving laws of Congress, and thehighest law of all - the Constitution. TheSupreme Court, however, is far from all-powerful. Its power is limited by the other two branches of government. The President nominates justices to the court.