What is the main duty of a U.S. Senator?

The main duty of a U.S. Senator is to vote on laws, which encompasses the legislative responsibilities assigned to them in the United States Constitution. Senators participate in the law-making process by considering, debating, and ultimately casting votes on proposed legislation. This voting process is crucial because it determines which laws will be enacted or rejected.

While proposing new laws is a function that Senators do engage in, it is not their primary duty. Enforcing laws falls under the executive branch of government, which is separate from the legislative functions of Senators. Similarly, the interpretation of laws is designated to the judicial branch, particularly the courts, rather than to Senators. Therefore, the act of voting on laws embodies the fundamental role of a Senator within the legislative process.