If the US Supreme Court agrees with the lower court ruling, the decision is "affirmed," and becomes legally final (res judicata).
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Affirmed
No the Congress can not nullify a ruling of the Supreme Court. The Congress would have to rewrite the law which the Supreme Court had declared unconstitutional. Then the new law could overrule the Supreme Court IF the new law was declared constitutional if/when appealed.
The ruling of the court below the Supreme Court will be upheld. The Supreme Court is similar to an appeals court. If they don't want to take the case, then whatever the court ruling was will stand.
Majority opinion
The Supreme Court's ruling is final and cannot be appealed. The United States Supreme Court consists of the Chief Justice of the United States and eight associate justices.