Our system of government established three separate branches of goverment, each with a specific function, each acting as checks and balances upon the other. From a legal perspective, the Legislative branch was authorized to write the laws of the land and our Judicial branch was authorized to interpret how those laws are being applied fairly across the nation. Should there be a conflict between private citizens or another entity, i.e., a corporation or the U.S. Government itself, i.e., and the Supreme Court believes Congress has overstepped its bounds and infringes on the rights of the citizenry, they can rescind that law.
Congress also has the authority under the Constitution to overturn a law, but only either by sending such a bill for rescission to the President for approval or, if disapproved, a 2/3rd vote is obtained in both chambers of Congress. Otherwise, the President does NOT have the authority NOT to uphold a law nor to direct the Supreme Court not to take up same in the highest court of the land.