The Congress may nullify the Supreme Court rulings either by enacting a new statute or amending an existing law.
Basically, the Congress (Legislative) serves as a check on both the Judiciary and Executives branch of government.
The principle of Check and Balance ensures that each branches can prevent other branch from getting too powerful in the government.
So, when a ruling is given by the Supreme court and are not deem fair, the congress can respond by enacting a new statute or amending an existing law to counter the ruling.
Read more about Congress Power here
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