The best explanation of President Andrew Jackson's statement is:
The Supreme Court does not have the power to enforce its decision, so President Jackson could ignore it.
This reflects the idea that while the Supreme Court can declare laws or actions unconstitutional, it lacks the authority to enforce its own rulings, relying on the executive branch to do so. Jackson's response indicates his unwillingness to enforce the Court's decision in favor of the Cherokee, thus showing his disregard for the ruling.