As with many questions especially about government or politics this is very vague. Legislators are the ones who write laws. However, after they write the laws there are then administrative type rules that are written to the people who do the daily job. These are written by the agency the law was written for. SO if it's a Chidl support issue, the Federal agency ACF is in charge of writting those and then usually at the state level the their DOJ will write more detailed ones. At the federal level these are called CFR's, Code of Federal Regulation. At the state level they are commonly called Administrative Rules. If you want a law written, you have to talk to a legislator and if you want that law properly interpreted for the people in the offices you go to that specific agency.
The President is responsible for implementing and enforcing the laws written by Congress. He appoints the heads of the federal agencies, including the Cabinet, to help meet that responsibility.
The official rules and notices of US agencies are typically published in the Federal Register, which is the daily journal of the federal government. Additionally, the Code of Federal Regulations (CFR) contains a codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the federal government.
federal agencies enforce newly written tax laws
The executive branch of the US government includes the President, Vice-President, Cabinet, independent federal agencies, and US armed forces. The power of the executive branch lies with the President, who is responsible for implementing and enforcing the laws written by Congress.
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The president is responsible for implementing and enforcing the laws written by Congress and, to that end, appoints the heads of the federal agencies, including the Cabinet. The Vice President is also part of the Executive Branch, ready to assume the Presidency should the need arise. I got this information from the website (https://www.whitehouse.gov/1600/executive-branch)
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The Executive Branch of Government enforces the laws set by the Legistlative Branch.
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