The executive branch administrating a federal law is?
Executive branch makes sure the laws are enforced.
The Constitutional mandate of the executive branch is to execute and enforce the laws, while the mandate of the judicial branch is to "say what the law is"; that is, it can declare a "law" or part thereof unconstitutional. In the U.S., the federal government appoints the Solicitor General to advocate for the executive branch in federal court.
The Executive Branch. The President of the United States is the leader of the executive branch of government. All of the law enforcement agencies in the United States are also part of the executive branch. The Legislative branch creates the law. The Judicial branch interprets the law. The Executive branch enforces the law.