A simple majority can overturn a previous ruling. This is what happened when the current idiots declared corporations "people" for legal purposes and will allow them to buy and sell politicians even more in US elections.
All US Supreme Court decisions require a simple majority vote for a decision. For example, if nine justices hear a case, at least five must agree on a decision.
The only court that can overturn a US Supreme Court decision is the Supreme Court itself.
There are currently 9 Supreme Court Justices, so for there to be a majority ruling, 5 would have to rule a certain way.
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.
majority opinion
Majority opinion
majority opinion
Majority opinion
Majority opinion
For a majority ruling on the Supreme Court, a minimum of five out of the nine justices must agree. This is because a majority decision requires more than half of the justices to support a particular outcome or opinion. It is necessary to have a majority in order to establish a binding decision for the Court.
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Justices have an option to dissent from a ruling issued by a majority of the Supreme Court
majority opinion
majority opinion