If you really believe that, then you have a child’s understanding of the Supreme Court. It is anything but as simple as you seem to believe. SCOTUS has original jurisdiction over a few narrow kinds of cases. These are powers Congress can’t amend or change. Disputes between the states and disputes involving ambassadors are examples of these. But there’s also appellate jurisdiction - where a court has a right to appeal decisions made by other courts. This authority isn’t absolute. The Constitution states: In all cases affecting ambassadors, other public ministers and consuls, and those in which a state shall be party, the Supreme Court shall have original jurisdiction. In all the other cases before mentioned, the Supreme Court shall have appellate jurisdiction, both as to law and fact, with such exceptions, and under such regulations as the Congress shall make. Congress can just flat out say, “SCOTUS isn’t allowed to rule on this topic,” and it can’t. This has been done multiple times in US history.