Which of the following is NOT a power granted to Congress?

The power to "Enforce laws" is not explicitly granted to Congress in the Constitution. Instead, this power primarily belongs to the executive branch, which is responsible for the implementation and enforcement of laws passed by Congress. The president, as the head of the executive branch, has the authority to ensure that federal laws are executed, while Congress's role is to create and legislate those laws.

On the other hand, the other options reflect powers explicitly granted to Congress. Congress has the authority to regulate interstate commerce, allowing them to create laws that govern trade between states. It also has the power to collect taxes, which is essential for funding government operations and services. Additionally, Congress holds the power to declare war, which is a significant responsibility outlined in the Constitution. These powers are well-defined within the framework of the U.S. Constitution, establishing a clear division of responsibilities between the legislative and executive branches.