在美国联邦层面,立法机关创设行政机关并限制其职权是行政法的首要原则。无论何种形式的行政机关都必须由立法机关制定法律加以创设,该法律是行政机关权力的基本来源。一、美国联邦政府部门组织法立法的历史梳理根据宪法,美国总统执掌行政权,统辖联邦政府行政分支系统(Executive Branch of the Federal Government)。联邦政府行政分支系统主要包含以下几类部门组织:(1)总统行政办公室(Executive Office At the federal level in the United States, it is the primary principle of administrative law that the legislature should set up an administrative organ and limit its powers. No matter what form of administration must be created by the legislature to enact laws that are the basic source of power for the executive. I. History of Constitutional Legislation in the U.S. Federal Government According to the Constitution, the U.S. president runs the executive power and administers the Executive Branch of the Federal Government. The federal government administrative branch system mainly includes the following types of departmental organizations: (1) Executive Office of the President (Executive Office