My answer to Who has the final legal power in the USA, the US President Trump or a Federal Judge?
Answer by Ken Larson:
In the United States the final legal power is The Rule of Law.
Law is a function of law making by the elected representatives of the people – the Congress. The president can veto a proposed law, but the Congress can override his veto with a majority vote.
When laws are enacted the President and the Judiciary are sworn to enforce them.
Your question is not so much a matter or power as it is a matter of understanding how the U.S. tripartite form of government works.
Our constitution guarantees a balance of power between the entities of government.
The law is the ultimate power and until the law changes the President and the Judge are sworn to enforce it.
Interpreting the law is sometimes necessary to provide clarity in world of changing events. The ultimate power in that process is with the U.S. Supreme Court. Their interpretive rulings stand and must be enforces by all powers of government.
The above process has stood the test of time for over 200 years.