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War Powers Act in AP US Government

The War Powers Act (officially the War Powers Resolution) is a 1973 law Congress passed over President Nixon's veto to limit the president's ability to send troops into combat without congressional approval. It requires the president to report to Congress within 48 hours of committing forces to hostilities and to remove them within 60 days unless Congress declares war or authorizes the action.

This definition is part of Fiveable's AP US Government review, which also has guided practice questions.

Verified for the 2027 AP US Government exam•Last updated November 2026•Fiveable Content Team

Kosovo, 1999: when the 60-day clock ran out

In March 1999, President Clinton launched a NATO air campaign against Serbia over its attacks on ethnic Albanians in Kosovo. The bombing lasted 78 days, well past the War Powers Act's 60-day limit, and Congress never passed an authorization for it.

Nothing happened to Clinton. No troops were forced home, and no court stepped in. That gap between what the law says and what presidents actually do is the main thing to understand about the War Powers Act.

What Congress wrote into the 1973 law

Congress passed the act after Vietnam, a war fought for years with no declaration of war. Presidents had relied on the 1964 Gulf of Tonkin Resolution and their own commander-in-chief power. The act's main requirements are:

  • The president must consult with Congress "in every possible instance" before sending forces into hostilities.
  • In covered situations, the president must report to Congress within 48 hours of deploying troops.
  • Forces must be withdrawn within 60 days unless Congress declares war, authorizes the action, or extends the deadline. The 60 days start when the report is submitted or when it was due, whichever comes first.
  • The president can get up to 30 more days for withdrawal, but only by determining and certifying to Congress in writing that unavoidable military necessity for the troops' safety requires it.

The act is a statute, an ordinary law, so it sits below the Constitution. Congress can't use it to rewrite the president's constitutional powers. It can only try to set rules for how those powers get used.

Commander in chief vs. the power to declare war

The dispute over the act comes from a split in the Constitution. Article I gives Congress the power to declare war, and Article II makes the president commander in chief. The War Powers Act is Congress's attempt to enforce its side of that split, and it fits in Unit 2, especially Topic 2.5 (Checks on the Presidency) and Topic 2.6 (Expansion of Presidential Power). Both topics ask how far presidential power should reach and who gets to decide.

Presidents from both parties have argued the act unconstitutionally limits their Article II role. In Libya in 2011, the Obama administration claimed U.S. air operations didn't count as "hostilities" under the act, so the 60-day clock didn't apply. That's an example of a president interpreting and justifying his own power, which is exactly what Topic 2.6 asks you to explain.

Congress has used its stronger tools when it chose to. Before the Iraq War, it passed an authorization for the use of military force in 2002. Congress can also refuse to fund a war, though cutting off money for troops in the field is politically risky. Vietnam, Iraq, Kosovo, and Libya each show this tension in a slightly different way.

Building a Concept Application or Argument Essay answer with it

A member of Congress complains that the president deployed troops without authorization, and the question asks which check that member is relying on. The War Powers Act is the answer to that kind of multiple-choice question about how Congress checks the president's military or foreign policy power.

In Question 1 (Concept Application), a scenario might describe a president sending troops abroad without asking Congress. A strong answer names the War Powers Act as the relevant check, explains what it requires, and explains why it often fails to stop the president. Presidents dispute its constitutionality, and Congress rarely forces the issue.

In Question 4 (Argument Essay), the act works as evidence on a prompt about whether presidential power has grown too large or whether Congress can check it. Pair it with Federalist No. 70, a required document. Hamilton argued that a strong single executive is needed to protect the nation from foreign attack, and you can use that to support or rebut a claim about presidential war-making.

The wrong answer: "the president needs Congress's approval first"

The act does not require approval before troops go in. It calls for the president to consult Congress beforehand in every possible instance, but consulting isn't the same as getting a vote. In covered situations, the president then has to report within 48 hours, and the 60-day window starts when that report is submitted or was due, whichever comes first. Answer choices that say the president must get a vote of Congress before any military action are describing a declaration of war or an authorization, not the War Powers Act.

The other mix-up is treating the act as the source of the declaration power. The power to declare war comes from Article I of the Constitution. The War Powers Act is a 1973 statute meant to protect that power after presidents stopped asking for declarations. The last formal declarations of war came during World War II.

Where this sits in AP® Gov

Keep studying AP® Gov Unit 2