Final answer:
The Federal Register is the publication where any American can post comments in response to proposed governmental rules during the policy implementation phase.
Step-by-step explanation:
During the implementation phase of policymaking in the United States, any member of the public has the opportunity to post comments in response to proposed rules in a daily publication known as the Federal Register. The Federal Register is the official journal that documents all federal rules and proposed rules. It was designed to facilitate public participation in the government's rulemaking process by providing notice and inviting comment from the public, thus enabling an interactive democratic process. The implementation process also often involves federal negotiated rulemaking, where bureaucracies work out how new policies, regulations, or programs will be enacted, particularly when the legislation isn't specific in its directives. This public comment period is an important aspect of the regulatory process as it provides a transparent platform for citizens to share their opinions and concerns regarding governmental actions and potential regulations.