Whose responsibility is it to determine if governmental acts are constitutional?

The Legislative Branch (Congress) makes the laws.

The Executive Branch (President) make sure the laws are carried out.

The Judicial Branch (courts) make sure that these laws and acts don't violate the U.S. Constitution.

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The responsibility to determine if governmental acts are constitutional primarily lies with the judiciary branch of government. In many countries, including the United States, there is a system of judicial review, which grants courts the power to review laws and actions by the other branches of government to ensure that they are consistent with the constitution.

Here's how the process works:

1. A case is typically initiated by an individual or organization, challenging the constitutionality of a specific government act, law, or regulation.

2. The case is filed in a court of law, and both sides present their arguments. The party challenging the constitutionality of the act is usually known as the "plaintiff," while the government or relevant authority responsible for implementing the act is known as the "defendant."

3. The court then evaluates the arguments presented and examines the relevant laws and precedents. They analyze the language and intent of the constitution, as well as any applicable statutes, to determine if the act in question violates the constitution.

4. The court issues a decision, providing their interpretation of the constitution and ruling on the constitutionality of the governmental act. If they find the act unconstitutional, they may declare it void or recommend that it be amended or repealed.

It is important to note that determining constitutionality is an ongoing process and can be subject to interpretation. Courts at various levels, including lower courts and appellate courts, may have a different perspective on the constitutionality of a governmental act. Ultimately, the highest court in the respective country (such as the Supreme Court in the United States) may have the final say on constitutional matters.