Constitution
The Constitution is the supreme law of France, at the top of the legal hierarchy. The current Constitution, adopted on October 4, 1958, establishes the Fifth Republic. It defines the organization of public powers, the fundamental rights of citizens, and the principles of the Republic. It can be amended through constitutional revision, either by referendum or by Congress (the National Assembly and Senate meeting together). The Constitutional Council ensures that laws passed by Parliament conform to the Constitution.
Example
When a new law is passed, the Constitutional Council can be called upon to verify that it does not contradict the principles enshrined in the Constitution.