Cabinet-Level Departments: Structure, Confirmation, and Vacancies

The federal government has 15 cabinet-level departments, each created by Congress and led by a Secretary (or, at the Department of Justice, the Attorney General) who is nominated by the President, confirmed by the Senate, and serves as both the head of a large agency and a member of the President’s Cabinet. Title 5, Section 101 of the U.S. Code names all 15 by statute, which is what distinguishes them from the many independent agencies, boards, and commissions that also sit inside the executive branch.¹

The constitutional hook is short. Article II, Section 2 lets the President “require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices.”² From that clause grew the Cabinet system that has operated since Washington’s first term.

The 15 Departments

Congress establishes each department by statute. The list below follows the statutory order in 5 U.S.C. § 101, which also tracks roughly with when each was created:¹

Department of State (1789) — foreign policy, diplomatic relations, embassies and consulates.³
Department of the Treasury (1789) — federal revenue, national debt, tax collection through the IRS, and currency production.
Department of Defense (1947) — the Army, Navy, Air Force, Marine Corps, and Space Force under a single civilian-led structure. It evolved from the War Department established in 1789.
Department of Justice (1870) — federal law enforcement and prosecution. Led by the Attorney General.
Department of the Interior (1849) — federal lands, national parks, natural resources, and Native American affairs.
Department of Agriculture (1862) — farm policy, food safety inspection, rural development, and nutrition programs like SNAP.
Department of Commerce (1903) — economic development, the census, patents and trademarks, and weather monitoring through NOAA.
Department of Labor (1913) — workplace safety, wage and hour enforcement, and employment statistics.
Department of Health and Human Services (1953) — public health, Medicare and Medicaid, and agencies including the CDC and FDA.
Department of Housing and Urban Development (1965) — affordable housing, community development, and fair housing enforcement.
Department of Transportation (1966) — highways, aviation, railroads, and transit.
Department of Energy (1977) — energy policy, nuclear weapons programs, and energy research.
Department of Education (1979) — federal student aid, education data, and civil rights enforcement in schools.
Department of Veterans Affairs (1988) — healthcare, disability compensation, education benefits, and home loan guarantees for veterans.
Department of Homeland Security (2002) — border security, immigration enforcement, cybersecurity, and disaster response through FEMA. Created after the September 11 attacks.

Defense is by far the largest employer, accounting for roughly 34% of the entire federal civilian workforce. Veterans Affairs, Homeland Security, Justice, and Treasury round out the top five.

How a Department Is Organized

Every department follows a similar hierarchy. The Secretary sits at the top as the President’s direct link to the agency. A Deputy Secretary runs day-to-day operations and steps in when the Secretary is unavailable. Below the Deputy, a layer of Under Secretaries and Assistant Secretaries manage specific policy areas or operational divisions. Titles and headcount vary, but the layered structure is consistent across all 15.

The structure exists because broad federal mandates need to be broken into manageable pieces. The Secretary of Health and Human Services cannot personally oversee Medicare reimbursement rates, FDA drug approvals, and CDC disease surveillance at the same time. Under Secretaries and their staffs handle the specialized work while the Secretary focuses on overall direction and White House coordination.

Two Jobs at Once

A Cabinet Secretary does two distinct things. The first is running the bureaucracy: managing thousands of employees, setting operational priorities, and making sure the agency follows the laws Congress has passed. The second is advising the President and translating the administration’s agenda into concrete regulations and programs. Secretaries also spend significant time on Capitol Hill, testifying before committees to defend budget requests, explain policy decisions, and account for how their department is spending taxpayer money.

Inspector General Oversight

Every cabinet department has an Office of Inspector General established under federal law to provide independent oversight.⁴ Inspectors General audit programs, investigate fraud and waste, and report findings both to the department head and directly to Congress. They work inside the department but answer to the law rather than to the Secretary’s political priorities. The same statute protects whistleblowers who bring complaints to the IG’s office.

How Secretaries Get the Job

Appointing a Secretary is a multi-step process involving the White House, the FBI, ethics officials, and the Senate. It can run weeks or months.

Vetting and Financial Disclosure

Before the President announces a pick, the White House Personnel office screens prospective nominees. The FBI runs a background investigation covering employment history, finances, education, residency, marital history, and citizenship, interviewing former employers, neighbors, and colleagues.⁵

Nominees must file a Public Financial Disclosure Report (OGE Form 278e) with the Office of Government Ethics within five days of nomination, listing assets, income, liabilities, and outside positions.⁶ Where conflicts exist, the nominee signs an ethics agreement to divest certain assets or recuse from decisions affecting their financial interests. Knowingly falsifying the disclosure can bring civil penalties or criminal prosecution.

Committee Hearing and Floor Vote

The President formally submits the nomination to the Senate, and it is referred to the committee with jurisdiction over the relevant department.⁷ The committee holds public hearings, questions the nominee, and votes on whether to send the nomination to the full Senate. A simple majority of the full Senate confirms. Before 2013, Senate rules effectively required 60 votes to overcome a filibuster on executive nominations; that threshold was eliminated through a procedural change.

The Anti-Nepotism Rule

Federal law prohibits the President from appointing a relative to a position in any agency the President controls, and the statute defines “relative” broadly to reach parents, children, siblings, in-laws, step-relatives, half-siblings, aunts, uncles, nieces, nephews, and first cousins.⁸ It applies to civilian positions across the executive branch, Cabinet posts included.

Recess Appointments

Article II, Section 2 lets the President fill vacancies during a Senate recess without confirmation, but these commissions expire at the end of the Senate’s next session.⁹ The Supreme Court narrowed the power in NLRB v. Noel Canning (2014), holding that a recess of three days or fewer is too short to trigger the power, and recesses between three and ten days are “presumptively too short” unless extraordinary circumstances make the Senate genuinely unavailable.¹⁰ The Senate now holds brief pro forma sessions every few days during long breaks, in part to prevent recess appointments.

Vacancies and Acting Secretaries

When a Secretary dies, resigns, or becomes unable to serve, the Federal Vacancies Reform Act governs who fills the seat temporarily. There are three options: the “first assistant” to the office (typically the Deputy Secretary) automatically becomes acting; or the President can designate another Senate-confirmed official from anywhere in the executive branch; or the President can designate a senior career employee from the same department who has served there at least 90 days and holds at least a GS-15 pay grade.¹¹

Acting officials face a 210-day limit from the date the vacancy occurs. For vacancies open in the first 60 days after a new president’s inauguration, the window extends to 300 days. If the President submits a nomination during this period, the clock pauses while it is pending; if the nomination fails, is withdrawn, or is returned, the President gets a fresh 210 days. The enforcement mechanism has real teeth: any action taken by someone serving as acting officer in violation of the statute “shall have no force or effect,” and regulated parties can challenge agency decisions in court on that basis.

Removal by the President

Unlike heads of many independent agencies, who often have statutory protections against removal, Cabinet Secretaries serve entirely at the President’s discretion. The First Congress in 1789 recognized the President’s right to remove department heads without Senate involvement, a resolution driven largely by James Madison’s argument that the President needed direct control over executive officers to fulfill the constitutional duty to “take Care that the Laws be faithfully executed.”¹² The Supreme Court cemented the principle in Myers v. United States (1926). In practice, a President can fire any Cabinet Secretary at any time, for any reason.

Cabinet Rank vs. Statutory Department

Not every official the media calls a “Cabinet member” runs one of the 15 statutory departments. Presidents routinely grant “Cabinet rank” to other officials, such as the White House Chief of Staff, the Administrator of the EPA, the Director of the Office of Management and Budget, the U.S. Trade Representative, and the Ambassador to the United Nations. The Vice President always participates in Cabinet meetings as well. Which positions get elevated varies from one administration to the next.

The distinction matters for two reasons. First, only heads of the 15 executive departments are in the presidential line of succession. Second, the statutory departments have organizational structures set by Congress, while a Cabinet-rank designation is purely a presidential choice with no legal permanence beyond the current administration.

Presidential Line of Succession

Under the Presidential Succession Act of 1947, if both the President and Vice President cannot serve, the Speaker of the House acts as President, followed by the President pro tempore of the Senate. After them, the heads of the 15 executive departments step in, ordered by the date each department was originally established.¹³

The Cabinet order is: State, Treasury, Defense, Attorney General, Interior, Agriculture, Commerce, Labor, Health and Human Services, Housing and Urban Development, Transportation, Energy, Education, Veterans Affairs, and Homeland Security.¹⁴

Not every Secretary qualifies automatically. The statute specifies that succession “shall apply only to such officers as are eligible to the office of President under the Constitution.”¹⁴ A Secretary who is not a natural-born citizen, is under 35, or has not been a U.S. resident for at least 14 years would be skipped.

1
Office of the Law Revision Counsel. 5 USC 101
2
Constitution Annotated. Article II Section 2
3
National Archives. Department of State Records
4
Office of the Law Revision Counsel. 5 USC Chapter 4 – Inspectors General
5
U.S. Department of Justice. Memorandum of Understanding Regarding Name Checks and Background Investigations
6
Office of Government Ethics. OGE Form 278e Public Financial Disclosure Report
7
United States Senate. About Nominations
8
Office of the Law Revision Counsel. 5 USC 3110
9
Constitution Annotated. Overview of Recess Appointments Clause
10
Justia Supreme Court. NLRB v. Canning, 573 U.S. 513 (2014)
11
Office of the Law Revision Counsel. 5 USC 3345
12
Justia Law. The Removal Power
13
Congress.gov. Amdt20.S4.1 Congress’s Power to Provide Further for Presidential Succession
14
Office of the Law Revision Counsel. 3 U.S. Code 19 – Vacancy in Offices of Both President and Vice President; Officers Eligible to Act