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When it comes to the Supreme Court, it can be said that the decisions made at this particular court cannot be overturned. A Supreme Court ruling cannot be overturned by any particular entity, which includes the President of the United States and Congress.
In the Constitution, the United States Supreme Court is essentially granted the power of the "supreme law of the land," and all of its decisions are meant to be final. For this reason alone the Supreme Court has the power to hear cases from other jurisdictions to render the final decision in matters of dispute regarding decisions made by lower courts.
However, there is one particular situation in which a Supreme Court ruling can be overturned. A Supreme Court ruling can only be overturned by the Supreme Court itself. Such a situation will prove to be rare.
Constitution laws has more information on overturning a Supreme Court ruling.