Congress makes federal laws. Article I of the Constitution vests all legislative power in a Congress of two chambers: the House of Representatives and the Senate. Neither the Supreme Court, the attorney general, nor the Justice Department writes statutes. Each plays a different role after Congress acts: the Court interprets, the attorney general and Justice Department enforce and defend. Confusing those roles is the root of most misinformation about who actually makes federal law.
The confusion is understandable because each institution produces documents that look law-like. The Supreme Court issues opinions that bind lower courts. The attorney general issues charging policies that shape enforcement nationwide. The Justice Department publishes regulations in the Federal Register. None of these is a statute, and each derives its authority from statutes Congress wrote. This explainer separates the four institutions by constitutional function, traces how a bill becomes an enforceable federal law, and flags the edge cases where the lines blur.
The constitutional mechanism: who holds legislative power
Article I, Section 1 states that "All legislative Powers herein granted shall be vested in a Congress of the United States." That sentence is the whole answer to who makes federal laws. The House and Senate pass identical bill text, and the president signs it or Congress overrides a veto by two-thirds in each chamber. The result is a statute in the United States Code.
The Supreme Court's power sits in Article III, which establishes the judicial branch and extends federal jurisdiction to cases arising under the Constitution and federal law. The Court's authority to strike down a statute as unconstitutional was asserted in Marbury v. Madison in 1803. That power is judicial review, not lawmaking. When the Court invalidates a statute, the statute does not become a new one; it stops being enforceable. Someone must still write a replacement if Congress wants the policy to persist.
The attorney general and the Justice Department sit in Article II, the executive branch. The attorney general heads the department, which Congress created in 1870, and serves as the nation's chief law enforcement officer. Executive agencies issue regulations under authority Congress delegates in statutes. Those regulations carry the force of law but depend on a statutory grant; strip the grant and the regulation falls.
How a bill becomes an enforceable statute
A bill begins in the House or Senate, except revenue bills, which must originate in the House. Committees hold hearings, mark up text, and report the bill. Each chamber debates and votes, then a conference committee reconciles differences if the versions diverge. Both chambers pass the identical text and the president signs it, or a two-thirds vote in each chamber overrides a veto.
Congress has passed roughly 30,000 to 40,000 public laws across its history, and annual output now runs in the low hundreds. The 117th Congress (2021–2022) enacted 361 public laws, according to GovTrack's tally. Compare that to the 8,000 to 10,000 bills introduced per Congress. Most proposals die in committee, which is where the real gatekeeping happens.
After enactment, the statute often directs an agency to fill in details. That is delegated rulemaking. The Justice Department, for example, issues regulations implementing statutes Congress passed, such as the Americans with Disabilities Act. The regulation is binding, but a court will ask whether the agency stayed within the statute. If it did not, the regulation is invalid.
Quantified context: the scale of each institution
The Supreme Court decides roughly 60 to 80 cases per term out of more than 7,000 petitions for certiorari filed. That ratio matters: the Court is a tiny filter, not a legislature. About half its docket involves statutory interpretation, where the question is what Congress meant, not what the Court thinks is good policy.
The Justice Department employs roughly 110,000 to 120,000 people, including about 10,000 attorneys and 4,000-plus in the FBI alone. It operates 94 U.S. attorney offices and the main litigating divisions. Its budget request for recent fiscal years has topped USD 40 billion. The attorney general sets enforcement priorities within that apparatus, which is why a change of administration shifts outcomes even when statutes stay unchanged.
Congress runs on a far smaller payroll by comparison. The House and Senate together employ roughly 15,000 to 20,000 people, including committee staff and the Congressional Research Service. The asymmetry is real: Congress writes broad text with limited staff, and executive agencies with deep expertise interpret it. That is the structural reason administrative law matters so much.
Timeline: who acts at each stage
| Stage | Actor | What happens | Timing |
|---|---|---|---|
| 1. Bill introduced and referred | Member of Congress | Text assigned to committee | Day 1 |
| 2. Committee markup and report | Congressional committee | Text revised, reported to floor | Weeks to months |
| 3. Floor votes and conference | House and Senate | Passage of identical text | Months |
| 4. Presidential signature or veto override | President, then Congress | Enactment into the U.S. Code | Days after passage |
| 5. Delegated rulemaking | Executive agency, e.g., Justice Department | Proposed rule, comment period (typically 30–90 days), final rule | Months to years |
| 6. Litigation over meaning | Supreme Court and lower courts | Statutory interpretation | Years |
| 7. Enforcement choices | Attorney general and Justice Department | Prosecution and civil priorities | Continuous |
The table makes the division of labor concrete. Congress starts the chain and agencies extend it. Courts resolve disputes along the way. Each step is authorized by the prior statute or by the Constitution itself.
Edge cases: where the boundary blurs
The line between making and applying law is clean in theory and messy in practice. Consider three edge cases.
First, Congress delegates broad authority to agencies. Chevron deference, the doctrine that courts defer to an agency's reasonable interpretation of an ambiguous statute, governed administrative law for four decades. In Loper Bright Enterprises v. Raimondo in 2024, the Supreme Court overruled Chevron and returned interpretive authority to courts. That shifted power from agencies to judges, not to Congress. The statute still originated in the legislature.
Second, enforcement discretion looks like lawmaking. When the attorney general issues guidance limiting prosecution of certain offenses, people affected by it experience a de facto rule change. But guidance does not repeal the statute. The underlying crime remains on the books, and enforcement policy can change with a memo.
Third, consent decrees and settlements that a Justice Department enters with a court can impose ongoing monitoring obligations. These bind specific parties, not the general public. They are enforceable orders, distinct from statutes, and must trace back to a statutory violation.
A counterintuitive detail: the Supreme Court never makes federal law, but its statutory interpretations effectively set the operative meaning until Congress amends the text. Courts functionally fix contestable content in a statute. When people say "the Court made that the law," they mean the Court settled what the words mean, not that it wrote them.
Misconceptions: four red flags
"The Supreme Court makes laws." No. It decides cases. A ruling that strikes a statute creates a gap, but filling that gap requires congressional action for general prospective rules. "The attorney general writes federal law." No. The attorney general enforces and administers. Guidance memos change enforcement priorities within existing statutes, and they are not statutes. "Justice Department regulations are statutes." No. Regulations are delegated rules under statutes. They rise and fall with the statutory authority behind them and are reversible by later action. "Congress runs law enforcement." No. Congress appropriates money and sets statutory frameworks. Investigations and prosecutions belong to the executive branch. "A bill passed by one chamber is law." No. Both chambers must pass identical text, and the president must sign or the veto must be overridden.
A related professional caveat: a statute's plain text governs, but legal meaning also depends on the drafting history and the interpretations already on the books. Reading the text alone can mislead. The law is the text as interpreted by courts under existing precedent.
Practical actions: how to verify who did what
These steps are concrete and verifiable.
Read the statute. Search the U.S. Code (Title and Section) and the enacted bill text at Congress.gov. Confirm the date of enactment and the signing statement. Read the regulation. Search the Federal Register and the Code of Federal Regulations. Note the statutory section the regulation cites as its authority; a missing or thin citation is a signal the rule will be litigated. Read the case. Look up the Supreme Court opinion on the Court's website. The syllabus, though unofficial, states the holding in a few sentences; confirm against the opinions. Read the enforcement memo. Attorney general memoranda are published by the Justice Department. Treat them as enforcement priorities, not as changes to the statute. Watch the ratio. Fewer than one in 100 cert petitions is granted. If a source claims a pending appeal proves the law changed, verify the docket. Track the clock. Comment periods for proposed rules run at least 30 days, and best practice is 60 to 90 days for significant rules. Missing that window forfeits a practical chance to shape the rule.
The unifying principle: whoever holds the statutory text holds the definitive statement. Everything else is a derivative act.
Limitations: what everything above cannot settle
This explainer describes stable constitutional structure. It does not resolve how any particular statute or regulation applies to an individual's facts. That is the work of a lawyer with the document in hand.
Two limits deserve emphasis. First, the boundary between delegated rulemaking and unconstitutional delegation is contested across administrations and courts, and the Loper Bright overruling of Chevron is recent enough that its downstream effects are still developing. Second, individual enforcement outcomes depend on prosecutorial discretion that no general article can predict.
The mechanisms stay stable because they rest on the Constitution, not on policy preference. President, Supreme Court, attorney general, Justice Department, Congress: only one writes federal law.
The information above is general educational content about the structure of federal lawmaking, not legal advice or an opinion about any specific dispute. It does not create an attorney-client relationship and should not be relied on to make legal decisions. Consult a qualified lawyer licensed in your jurisdiction for advice on your facts, and if you face a legal deadline or emergency, contact local legal services or emergency services immediately.