what government branch reviews treaties to determine if they are constitutional?

Answer 1

In the United States, the judicial branch reviews treaties to determine if they are constitutional. Specifically, the Supreme Court may hear cases that involve the interpretation of treaties and assess their constitutionality. While treaties are negotiated and signed by the executive branch (the President) and require the advice and consent of the Senate, it is ultimately the responsibility of the judicial branch to interpret the law and ensure that treaties comply with the Constitution.