Congress writes the nation’s laws, controls federal spending and can check the president. Yet most Americans can’t say who actually decides what gets a vote, and that gap is where a lot of frustration lives.
Understanding how Congress works means looking past the grand building and the speeches to the committees, leaders and rules where the real decisions get made.
Quick answer: Congress has two chambers, the House (435 voting members) and the Senate (100), and both must agree before a bill can become law. Most of the work happens in committees, which shape or stop bills, while party leaders control the schedule. Power is spread among leaders, committee chairs and, in the Senate, individual members using procedural rules.
The basic structure: two chambers, one job
Article I of the Constitution gives the legislative power to Congress, and it splits that power between two chambers. This was deliberate. The framers wanted lawmaking to require broad agreement, so any new law has to pass both bodies in identical form and then reach the president’s desk. For the wider picture, see our plain-language guide to how the US government works.
The two chambers are built differently on purpose, and the differences shape how each one behaves.
| Feature | House of Representatives | Senate |
|---|---|---|
| Voting members | 435 | 100 |
| Term length | 2 years | 6 years |
| Who is represented | A district within a state | An entire state (two per state) |
| Minimum age | 25 | 30 |
| Unique powers | Starts tax bills; can impeach | Confirms most nominees; ratifies treaties; holds impeachment trials |
| Style of rules | Majority party sets the agenda tightly | Individual senators have more procedural leverage |
The House is designed to be close to the people, with all seats up every two years—which is why midterm elections matter. The Senate is designed to be slower and more insulated, with only about a third of seats up in any election. Each state, large or small, gets two senators, a compromise made at the founding that still shapes who holds influence today.
To see how a proposal travels through these two bodies step by step, read how a bill becomes a law.
Congress was built so that getting something done requires many people to agree, and getting something stopped requires very few.
Committees: where most of the real work happens
Thousands of bills are introduced each Congress, and no chamber could debate them all on the floor. Committees are how Congress divides the labor. Each one covers a subject area, such as agriculture, armed services, finance or the judiciary, and its members become specialists in that field.
What committees do
- Hold hearings to hear from experts, agency officials, advocates and affected citizens.
- Revise bills in a process often called a markup, where members add, change or remove provisions.
- Decide what moves. A bill that the committee ignores usually goes nowhere, which is why most proposals quietly die there.
- Oversee agencies by investigating how the executive branch spends money and carries out the law.
Why chairs matter
The majority party in each chamber chooses the chair of each committee, and the chair has significant control over the agenda: which bills get hearings, when meetings are held, and what gets attention. Committee ratios also favor the majority party, so the party in charge usually controls the outcome.
Committee work also has a less visible side. Members who serve on a committee for years build relationships with the agencies and industries it oversees. Supporters say this produces real expertise. Critics worry it can create cozy relationships with the interests being regulated. Both things can be true at once, and understanding the incentive helps you read news about hearings more clearly.
Leadership: who controls the schedule
If committees shape the content of bills, leaders shape the calendar. Deciding what reaches the floor for a vote is one of the biggest forms of power in Congress, because a bill that never gets a vote cannot pass.
In the House
The Speaker of the House is elected by the full chamber, in practice by the majority party, and is the most powerful figure in the House. The Speaker sets the agenda, influences committee assignments and is second in the line of succession to the presidency after the vice president. Below the Speaker are the majority leader and the party “whips,” whose job is to count votes and keep the party members together.
The House also has a Rules Committee, often described as the traffic cop of the chamber. It sets the terms of debate for major bills, including how long they are discussed and whether amendments are allowed. Because the majority party controls it, it is a powerful tool for steering outcomes.
In the Senate
The vice president is the Senate’s president but votes only to break ties. Day-to-day, the majority leader is the key figure, deciding which bills and nominations come to the floor and in what order. The minority leader leads the opposition and has tools of their own to slow or shape the process.
The Senate is also where individual members hold unusual power. Under its rules, a single senator can sometimes delay action, and many bills need 60 votes, not a simple majority, to end debate. We explain this tool in detail in what the filibuster is and why it’s fought over.
Controlling the calendar is quiet power: a bill that never reaches the floor never has to be voted down.
The real power centers, beyond the titles
Formal titles tell only part of the story. Power in Congress also flows through less obvious channels, and knowing them explains why outcomes often differ from what the org chart suggests.
Political parties
Parties are the main organizing force. The majority party controls committees, the floor schedule and chairs. Party leaders raise money, help members get desired committee seats and can reward or discourage behavior. This is why, in practice, party affiliation often predicts how members vote better than their individual views on a given bill.
Staff
Members of Congress are generalists with enormous workloads. Congressional and committee staff research issues, draft legislative language, negotiate details and brief members. Much of the technical text of a law is shaped by staff, which gives them real, if unelected, influence.
Money and lobbying
Running for Congress is expensive, and members spend significant time raising funds. Organizations of every kind, from businesses and unions to advocacy groups and professional associations, also lobby Congress, offering information, arguments and political support. Lobbying is protected by the First Amendment’s right to petition the government, and it is also a channel where well-resourced groups can have an advantage. Reasonable people disagree about how much influence money really buys and what, if anything, should change. For the larger framework, see who has power in America.
Election lines and primaries
How districts are drawn and who votes in primaries shapes who gets elected and what they fear. A member in a district safely held by one party may worry more about a primary challenger than a general election opponent. That affects willingness to compromise. Learn more in what gerrymandering is and how primary elections work.
The power of the purse and other checks
Congress holds powers that shape the entire government, not just individual laws.
- Taxing and spending. The Constitution gives Congress the “power of the purse.” Federal agencies can spend only what Congress appropriates, which is why budget fights are so consequential.
- Oversight. Congress can hold hearings, demand documents and investigate how laws are being carried out.
- Confirmations and treaties. The Senate confirms most federal judges and top executive officials and ratifies treaties by a two-thirds vote.
- Impeachment. The House can impeach federal officials, and the Senate holds the trial.
- Declaring war and regulating commerce. The Constitution assigns these to Congress, though how they work in practice has shifted over time.
These powers are part of the system of checks and balances. See separation of powers explained with real examples for how Congress, the president and the courts constrain one another, and what the Supreme Court does for the judicial side.
Why Congress feels stuck, and the case on each side
Many Americans see Congress as slow, polarized and ineffective. That frustration is widely shared, but people disagree about what it means.
The case that the friction is a feature
Defenders argue the system is meant to be hard to move. Requiring two chambers, a presidential signature and often a supermajority in the Senate forces broad agreement and protects minority viewpoints. A law that has to survive many checkpoints is less likely to be reckless, and less likely to be reversed whenever power changes hands.
The case that the friction has become a problem
Critics argue that the modern combination of narrow majorities, party-line voting and heavy use of procedural delays means urgent problems go unaddressed. They point to deadlines passed, budgets handled through stopgap measures and major decisions pushed to the executive branch or courts because Congress doesn’t act. Some also note that citizens can’t easily tell who is responsible when nothing happens.
What the evidence supports
Facts, interpretations and values blend here. It is a fact that Congress’s design makes passing laws difficult. It is an interpretation whether today’s level of gridlock is healthy or harmful. And it is a values question how much weight to give stability versus responsiveness. Historians also note that periods of intense division are not new; see American history that explains today for context. The structural choices at the heart of this debate trace back to the founding, which we explore in republic vs. democracy.
Think about it: If you could change one thing about how Congress runs, such as committee power, Senate rules or how members are elected, what would it be, and what might someone who disagrees with you say is the risk? And when you vote, do you know how to read your ballot to find these races?
How you can follow and influence Congress
Understanding the machinery makes it easier to participate wisely. A few practical steps:
- Find your members. The official House and Senate websites list who represents you and how to contact them.
- Watch committees, not just the floor. Hearings are often streamed and show where a bill is really being shaped.
- Use official sources. Congress.gov is the official site for bill text and status. Check it directly, since rules, membership and schedules change.
- Be a careful news consumer. Coverage often focuses on conflict; our media literacy guide can help you read it critically.
- Show up in other ways. Voting is one tool among many; see 15 ways to show up beyond voting.
Some states also let citizens make laws directly, bypassing the legislature. We cover that in ballot initiatives and referendums. And because the federal system divides power with the states, federalism explains what Congress can and cannot do. For a broader overview, return to the Civic Foundations section.
Key takeaways
- Congress has two chambers, and both must pass identical text before a bill can reach the president.
- Most legislative work happens in committees, which hold hearings, rewrite bills and decide which ones move forward.
- Party leaders, especially the Speaker and the Senate majority leader, hold major power by controlling the floor schedule.
- Staff, parties, fundraising and election rules also shape outcomes, often more than formal titles suggest.
- Gridlock is partly by design; whether today’s version is a safeguard or a problem depends on your values as well as the facts.
- Official sources like Congress.gov let you check bill status and rules yourself.
Frequently asked questions
How many members are in Congress?
Congress has 535 voting members: 435 in the House of Representatives and 100 in the Senate. The House total has been fixed at 435 by federal law for about a century, with seats divided among states by population. Each state has two senators regardless of size. Several non-voting delegates also represent D.C. and U.S. territories in the House.
What is the difference between the House and the Senate?
The House has more members, serves shorter two-year terms, and is run mostly by majority-party rules and leaders. The Senate is smaller, has six-year terms, and gives individual senators more procedural power, including the ability to slow or block action through tools like the filibuster. Only the Senate confirms most presidential nominees and ratifies treaties.
What do congressional committees actually do?
Committees hold hearings, investigate problems, write and revise bills, and decide which proposals move forward. Most bills never leave committee. Each committee focuses on a subject, such as agriculture, armed services or finance, and its members tend to build deep expertise and relationships with the agencies and industries they oversee.
Who is the most powerful person in Congress?
There is no single answer, because power is spread out. The Speaker of the House controls the House’s agenda and is second in line to the presidency after the vice president. The Senate majority leader controls what reaches the Senate floor. Committee chairs, and in the Senate individual members using procedural rules, also hold significant influence.
Why does Congress seem to get so little done?
The Constitution was designed to make lawmaking require broad agreement: two chambers, a presidential signature, and many chances to stop a bill. Add narrow majorities, election-year incentives and party competition, and gridlock is common. Supporters see this as a safeguard against hasty or extreme laws; critics see it as a barrier to solving problems. Both views have evidence behind them.