Final answer:
Legislative regulations are issued by the Treasury Department when Congress delegates legislative powers for the administration or completion of operating rules. These regulations have the force and effect of law.
Step-by-step explanation:
When Congress delegates legislative powers to the Treasury Department to carry out the details of administration or to complete the operating rules, the regulations issued under this authority are often referred to as legislative regulations. These regulations have the force and effect of law, as they are authorized under the legislative power of Congress, which is further outlined in the U.S. Constitution. The process is part of the checks and balances within the U.S. government, allowing the bureaucracy, under the executive branch, to flesh out the details needed to implement and administer the laws passed by Congress.