
The United States Congress, established by Article I of the Constitution, consists of the House of Representatives and the Senate. The Constitution grants Congress the power to enact legislation and declare war, confirm or reject Presidential appointments, and substantial investigative powers. The Framers of the Constitution enumerated a list of powers that Congress could exercise to make laws to govern the country. These include the right to lay and collect taxes, regulate interstate commerce, declare war, coin money, and establish a court system. However, the Constitution also assumes that any power not mentioned is not given to Congress, and the legislative branch is subject to checks and balances to prevent absolute power.
| Characteristics | Values |
|---|---|
| Legislative Powers | Vested in Congress, which consists of the Senate and House of Representatives |
| Lawmaking | Congress can make new laws or change existing laws, but only in specific areas |
| Veto | The President may veto bills passed by Congress, but Congress can override this with a two-thirds majority in both the Senate and House of Representatives |
| Bicameral System | The Senate and House of Representatives act as a check on each other's powers |
| Checks and Balances | The President's treaties with other nations must be approved by a two-thirds vote in the Senate |
| Impeachment | The House of Representatives has the sole power of impeachment, but a trial occurs in the Senate, which can convict with a two-thirds majority |
| Enumerated Powers | The Constitution lists the powers of Congress, with the assumption that any power not mentioned is not granted to Congress |
| Necessary and Proper Clause | Congress can pass laws it deems "necessary and proper" to carry out its enumerated functions |
| Limited Government | The Articles of Confederation restricted the national government's powers, such as its ability to collect taxes for revenue or regulate trade |
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What You'll Learn

Congress's power to make laws is restricted by the Constitution
The United States Congress, as one of the three coequal branches of government, is vested with significant powers by the Constitution. Article I of the Constitution enumerates the powers of Congress and the specific areas in which it may legislate. Congress is the only part of the government that can make new laws or change existing laws. However, its power to make laws is restricted by the Constitution in several ways.
Firstly, the Constitution grants Congress enumerated powers, which are explicitly listed in the document. These powers are broad and include the right to lay and collect taxes, regulate interstate commerce, declare war, coin money, and establish a court system. The Framers of the Constitution included both explicit enumerated powers and implied powers to provide some flexibility for representatives to govern for the common good. However, they also intended to restrict congressional powers by adhering to the principle of limited government. This is reflected in the Tenth Amendment, which states that powers not specifically granted to the federal government are reserved for the states or the people. Therefore, Congress's lawmaking authority is limited to the powers listed in the Constitution and those that are "necessary and proper" to carry them out. Any powers not explicitly mentioned are retained by the states.
Secondly, the legislative process itself provides checks and balances on Congress's power to make laws. A bill must be introduced to Congress, referred to the appropriate committee for review, and undergo changes before passing both houses of Congress by a simple majority vote. Senators can also use the filibuster procedure to delay a vote on a bill, which requires a supermajority of 60 Senators to break. Once a bill passes both houses, it goes to the President for consideration, and they may veto it. While Congress can override a presidential veto with a two-thirds vote in both houses, this is a challenging threshold to meet.
Additionally, the Supreme Court plays a role in limiting Congress's lawmaking power. In recent years, the Supreme Court has expressed greater concern for states' rights and has issued rulings that limit Congress's power to pass legislation under the commerce clause or other powers contained in Article I, Section 8. For example, the Supreme Court has found certain federal laws unconstitutional on the grounds that policy matters should be managed by the states.
Overall, while Congress possesses significant lawmaking authority, the Constitution restricts this power through enumerated powers, the principle of limited government, the legislative process, and judicial review by the Supreme Court. These limitations ensure a balance of powers and prevent Congress from having absolute authority in the lawmaking process.
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Congress cannot declare war without the President's input
The United States Congress is made up of the House of Representatives and the Senate. Established by Article I of the Constitution, the Legislative Branch is one of the three coequal branches of government. The Constitution grants Congress the sole power to declare war.
The Founding Fathers wanted to avoid giving one person the authority to plunge the new nation into war. While the office of the president was crafted with George Washington in mind, the creators of the Constitution realized that those who followed might lack his virtues and humility. This was considered well-established constitutional law until around 1950.
In the early post-ratification period, the clause’s limit on presidential war-making was interpreted broadly. Many key founders, including Alexander Hamilton, George Washington, and James Madison, referred to the clause’s importance as a limit on presidential power. In the nation’s early conflicts, Congress’s approval was thought to be necessary – not only for the War of 1812, for which Congress issued a formal declaration, but also for lesser uses of force, including conflicts with Native American tribes on the Western frontier.
However, in modern times, Presidents have used military force without formal declarations or express consent from Congress on multiple occasions. For example, President Truman ordered U.S. forces into combat in Korea, and President Obama used airstrikes to support the ouster of Muammar Qaddafi in Libya. In general, most scholars and commentators accept that presidential uses of force are acceptable if they come within one of three (or possibly four) categories, though the scope of these categories remains contested. Presidents may use military force if specifically authorized by Congress. Authorization may come from a formal declaration of war, but it can also come from a more informal statutory authorization.
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The President can veto Congress's bills
The United States Congress is made up of the House of Representatives and the Senate, and is one of the three coequal branches of government. It is the only branch of government that can make new laws or change existing ones.
The President may veto bills passed by Congress, but Congress may override this veto with a two-thirds majority vote in both the Senate and the House of Representatives. This is a significant check on the President's power, as it allows Congress to pass legislation without the President's approval.
The process of passing a bill begins with its introduction to Congress. A bill must pass both houses of Congress before it goes to the President for consideration. If the President does not approve of the bill, they may return it unsigned within ten days (excluding Sundays) to the house of Congress in which it originated. The President must state their objections to the bill in writing, and Congress is required to consider them.
Historically, Congress has overridden about 7% of presidential vetoes. When a veto is overridden, the bill becomes law without the President's signature. However, if Congress adjourns before the ten days have passed, during which the President might have signed the bill, the bill fails to become law. This is called a pocket veto.
The veto was constructed during the Constitutional Convention not as an absolute veto, but with limits, such as Congress's ability to override it. The veto was referred to as a "revisionary power", with the primary object "to defend his own department", rather than to protect the general interest.
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Congress's power to tax is limited by the Constitution
The Constitution grants Congress the power to tax, but this power is limited in several ways. Firstly, direct taxes, such as income taxes, must be levied based on population, according to the rule of apportionment. This means that the amount of tax an individual or business pays is proportional to their income or wealth. Indirect taxes, on the other hand, must follow the rule of uniformity, meaning they are the same throughout the United States.
Articles exported from any state are also exempt from taxation. This means that Congress cannot tax goods that are exported from one state to another or internationally. This limitation is in place to encourage interstate and international commerce, which is essential for a strong national economy.
The Constitution also protects individual rights, thereby limiting Congress's power to tax. For example, taxing individuals for criticising the government would violate the Free Speech Clause. The Supreme Court has played a significant role in interpreting and enforcing these limitations, such as in the McCulloch v. Maryland case in 1819, which suggested that citizens could vote out politicians who misused the taxing power.
While Congress has the authority to assess, levy, and collect taxes independently, the scope of this power has been curtailed by judicial decisions. The Supreme Court's decision in United States v. Butler (1936) affirmed that Congress could use the Taxing Clause independently of its other constitutional powers. However, the Court has also ruled on specific cases, such as Pollock v. Farmers' Loan & Trust Co., where it held that a tax on income from property was void because it was not apportioned according to the census.
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Congress's power to regulate commerce is restricted by the Supreme Court
The United States Congress is made up of the House of Representatives and the Senate, and it is one of the three coequal branches of government. The Constitution grants Congress the sole authority to enact legislation and declare war, the right to confirm or reject many Presidential appointments, and substantial investigative powers.
Congress's power to regulate commerce is derived from the Commerce Clause, which is found in Article I, Section 8, Clause 3 of the Constitution. This clause grants Congress the power "to regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes." The Framers of the Constitution included this provision to eliminate trade barriers and create a unified economic front. Over time, its interpretation has expanded to cover various aspects of economic activity.
While the Commerce Clause grants Congress significant power to regulate commerce, this power is not unlimited and has been restricted by the Supreme Court on several occasions. Initially, the Supreme Court interpreted this power narrowly, focusing on the direct movement of merchandise across state lines. However, as the economy became more complex, the Court recognized the clause's broad spectrum of authority.
In the case of United States v. Lopez (1995), the Supreme Court struck down the gun-free school zones act, a federal law banning guns in school zones. The Court ruled that the law was not sufficiently connected to economic activity to be justified by the commerce clause, thus restricting Congress's power to regulate commerce. Similarly, in United States v. Darby (1941), the Supreme Court upheld the federal government's authority to regulate labor standards across states, but also affirmed Congress's broad power under the commerce clause to enforce the Fair Labor Standards Act, which included prohibiting the shipment of goods produced under non-compliant conditions.
The Supreme Court has also set limits on Congress's power under the commerce clause in other cases, such as Gibbons v. Ogden (1824), where the Court affirmed federal supremacy in regulating interstate commerce, and Wickard v. Filburn (1942), which held that intrastate activities that could cumulatively affect interstate commerce fell within Congress's regulatory reach. These cases continue to shape how Congress legislates on matters affecting interstate commerce.
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Frequently asked questions
The Constitution grants Congress the power to enact legislation, declare war, confirm or reject presidential appointments, and substantial investigative powers. Congress can also lay and collect taxes, borrow money, regulate commerce, and establish a uniform rule of naturalization and uniform laws on bankruptcy.
The Constitution limits Congress's powers by outlining that all other law-making powers are left to individual states. The Constitution also states that Congress cannot act on any power that is not explicitly written down.
The Constitution divides power by creating a bicameral, or two-house, Congress, consisting of the Senate and the House of Representatives. The President may veto bills passed by Congress, but Congress can override this veto with a two-thirds majority in both the Senate and the House of Representatives.
The Framers of the Constitution granted Congress implied powers in addition to explicit powers. The implied powers clause, also known as the elastic clause, states that Congress has the power to ""make all laws which shall be necessary and proper for carrying into execution the foregoing powers".

























