What's the main difference between legislative and executive power?

The legislative branch, Congress, writes and passes federal law and controls all federal spending. The executive branch, the President, enforces and administers the laws Congress passes and directs the day-to-day operation of federal agencies and the military. Neither branch can do the other's core job alone.

Can the President declare war without Congress?

No, only Congress can formally declare war under Article I. In practice, however, presidents have committed U.S. forces to combat many times without a formal declaration, using the commander-in-chief power and, since 1973, the War Powers Resolution's more limited authorization framework instead.

Can Congress reject a treaty the President has negotiated?

The Senate specifically can, and has. A treaty requires ratification by a two-thirds Senate vote before it carries legal force, a bar high enough that the Senate has declined to ratify treaties presidents strongly supported, most famously the Treaty of Versailles after World War I.

Which branch has more power, the President or Congress?

Neither branch has more power overall, they have different powers that check each other. Congress can override a veto, control spending, and impeach; the President can veto legislation, direct the military and foreign policy day to day, and appoint officials. This site's Separation of Powers page covers the full picture.

What is an executive agreement, and how is it different from a treaty?

An executive agreement is an international commitment the President makes without Senate ratification, unlike a treaty, which requires a two-thirds Senate vote. Executive agreements let presidents act without that supermajority requirement, but they generally rest on less durable legal footing than a ratified treaty.

The United States Capitol building under a clear sky

Civics

Legislative vs. Executive Powers

Congress writes the law and controls the money. The President enforces the law and runs the military and foreign policy day to day. Here is exactly what each branch controls, and the three places their powers genuinely collide.

6-point comparison3 zones of real conflict

Two Different Jobs

Congress and the President do not compete for the same job, the Constitution assigns them different ones. The table and sections below lay out exactly what each branch controls on its own.

At a Glance

Comparison of legislative and executive powers
Power	Legislative Branch (Congress)	Executive Branch (President)
Making law	Writes, debates, and passes bills in both chambers	Signs bills into law or vetoes them
Spending	Controls all federal appropriations under Article I, Section 9	Can only spend what Congress has appropriated by law
War	Holds the constitutional power to declare war	Serves as commander in chief and can deploy troops short of a declared war
Treaties and diplomacy	Senate must ratify treaties by a two-thirds vote	Negotiates treaties and conducts day-to-day foreign policy
Appointments	Senate confirms federal judges and top officials	Nominates federal judges and top officials
Removal and oversight	Can impeach and remove the President and other officials	Can veto legislation, issue executive orders, and grant pardons

Sources & Further Reading

This page describes the Constitution's structural design and documented historical examples of it in practice. It takes no position on any current political dispute. Case examples are sourced to primary historical documents and Supreme Court opinions via Oyez.

Legislative vs. Executive Powers

Two Different Jobs

At a Glance

📚 Sources & Further Reading

Sources & Further Reading