Key Takeaways:
- Historical sources of outlining war powers between the president and Congress are present in the Constitution, which outlines the base legal roles of both branches in war, and in the War Powers Resolution of 1973.
- While the Constitution enshrines some war powers as clearly in the possession of Congress, it vaguely describes those granted to the president; within the War Powers Resolution the vagueness of presidential authority is addressed by introducing legal requirements in times of war.
- Advocates for reform often fall into the category of supporting a strengthening of legislative authority in war.
- Proponents of executive branch flexibility tend to favor reform options that take into consideration the strategic value of a swift, decisive president that can efficiently utilize the position of commander in chief.
How do War Powers Work?
By nature of the checks and balances system created by the framers of the Constitution, war powers are divided into two centers of authority, which creates a healthy amount of balance between government branches. Article 1, Section 8, Clause 11 of the Constitution grants Congress the power “To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water; . . .” along with the authority to fund military forces.
In conjunction with this, Article 2, Section 2, Clause 1 details the role of the president as commander in chief, whose authority is granted over the Army, Navy, and states to provide for the defense of the nation. This section of the Constitution is intentionally left vague, likely to protect the authority of Congress from potential ambitions of the executive branch. For a nation exiting a hard-fought Revolutionary War and facing a constant threat of war from imperial superpowers, the split of authority between the executive and legislative branches to discourage conflict was both ideology and survival strategy. In recent years, however, the balance of war authority has shifted to favor the executive branch, sparking debate on whether the nation has given the president too much authority at the expense of democratic accountability or efficiency.
For the majority of U.S. history, this contentious balance of war powers between the executive and legislative branches remained ideological, with little substantive action. However, this changed when Congress passed the War Powers Resolution of 1973, the most significant legislative attempt to rebalance war powers. The Resolution was introduced in response to the U.S.’ heavy military involvement in Vietnam and Cambodia without a formal declaration of war by Congress. While President Richard Nixon vetoed the bill, his veto was overridden as legislators on both sides of the aisle sought to ensure joint responsibility in conflict between the president and Congress. The resolution required that the president consult with congressional leadership prior to engagement in conflict and continue consultations with congress until cessation of hostilities.
Why Do Supporters Want to Revitalize Congressional Influence in War?
Proponents of the War Powers Resolution, and of recent war powers resolutions introduced in response to American military action in Iran, believe restoring congressional authority is critical to ensuring the alignment of national security policy with the design of the Constitution. Their central argument is that Article 1 entrusts Congress with the power to declare war, raise and support armies, and control budget appropriations to the millitary—it does not give that power to the president.
In response to the rise of executive-led military action over the past two decades, some advocates argue the War Powers Resolution of 1973 should be expanded and clarified. A report from the Center for a New American Security concludes that reforming the legal framework of war powers is one of the most effective ways to limit the escalation of U.S. involvement in conflicts. The report suggests updating the War Powers Resolution and narrowing the scope of Authorizations for Use of Military Force (AUMFs)—congressional grants of war authority to the executive—in order to ensure clearer limits on hostilities and to restore legislative authority in decisions about the use of military force.
Analysis from the Project on Government Oversight argues that current legal structures disproportionately favor the presidency. Reform advocates contend that Congress must reassert its role in war-making by setting clearer limits on executive action, including repealing or replacing existing AUMFs that allow broad interpretations of military authority. Such reforms, proponents argue, would strengthen oversight and reinforce the constitutional system of checks and balances.
Advocates also ground these proposals in the original purpose of the War Powers Resolution. As described in Lawfare, lawmakers intended the 1973 resolution to “fulfill the intent of the framers” by ensuring the “collective judgment of both the Congress and the President” in decisions about U.S. involvement in hostilities. Although many reformers acknowledge the law fell short of its goals, they argue its principles of shared responsibility remain consistent with the Constitution’s design.
Concerns about AUMFs have grown in the context of the War on Terror. Research supported by the Open Society Foundation notes that these authorizations remain in force decades after their passage because they lack sunset provisions. As a result, multiple administrations have relied on them to justify military actions beyond their original scope. Reform advocates therefore argue that narrowing or sunsetting AUMFs is necessary to prevent the expansion of conflicts without meaningful congressional oversight.
Some reform proposals also extend beyond traditional war powers to emergency and surveillance authorities. Analyses from the Cato Institute warn that expansive interpretations of the National Emergencies Act of 1976 can grant the executive branch broad discretionary powers without clear statutory limits. Similarly, scholarship on the Foreign Intelligence Surveillance Act and the Patriot Act highlights concerns about limited congressional oversight of national security surveillance. Because many surveillance activities are classified and reviewed by confidential Foreign Intelligence Surveillance Courts (FISAs), critics argue that congressional oversight is difficult, which could risk undermining both civil liberties and constitutional checks and balances.
Why Do Opponents Want to Let the Commander in Chief Lead?
Opponents of efforts to strengthen congressional oversight of war argue that the War Powers Resolution and recent attempts to constrain executive influence over military action are unnecessary and unconstitutional infringements on presidential authority. The Federalist Society challenges supporters’ narrative of the Vietnam War, arguing that Congress was not sidelined but actively participated through funding and authorization decisions. From this perspective, the idea that legislative restraints are needed to prevent “presidential adventurism” is historically flawed. Critics instead call for a reevaluation of Congress’s constitutional role in decisions about military deployment.
Some scholars also argue that the War Powers Resolution distorts constitutional checks and balances by favoring the legislative branch. An article from Case Western Reserve University School of Law suggests the law attempts to restructure the decision-making process around military conflict through rigid legal requirements rather than political negotiation. The Resolution’s provisions including conflict withdrawal deadlines and reporting timelines, critics argue, may limit deliberation shaped by present-day circumstances and instead create a rigid legal framework geared toward after-the-fact litigation. Presidents of both parties have raised similar concerns throughout history, while courts have historically declined to rule directly on disputes surrounding the law.
Critics also emphasize the Constitution’s designation of the president as commander in chief. Analyses from the Heritage Foundation argue that swift and unified presidential decision-making is necessary to respond to external threats, and aligns with the framers’ understanding of executive authority. This interpretation links the commander-in-chief clause with Article II powers to argue that the president holds primary responsibility for national security and for the initiation of hostilities abroad. Supporters of this view often contend that Congress’s slower and more politically-constrained processes may hinder timely responses to unconventional threats, especially as wartime actions evolve to include technologies like artificial intelligence (AI).
Arguments supporting executive branch war powers also extend to AUMFs. An article in National Defense University Press argues that expanding AUMF frameworks could reduce legal uncertainty in the ongoing War on Terror. Rather than viewing AUMFs as blank checks for presidential power, proponents describe them as tools that enable coordinated responses to evolving threats while maintaining communication between the executive branch and Congress. Historical legal interpretations have also shaped this view. Analyses from the National Security Archive highlight legal opinions during the U.S. invasion of Panama that supported broader interpretations of presidential war authority, with former Assistant Attorney General William Barr arguing that the president possesses constitutional authority to deploy military forces abroad and enforce international law in support of national security.
Why Does This Matter?
The framers of the Constitution purposefully designed a system of shared war powers to avoid the worst outcomes to any of these questions, yet whether current ideology represents a deviation from their original plan or a natural evolution with current events remains to be debated. Regardless of this, it remains clear that the balance of power between executive and legislative branches represents a critical, and intentionally tense, function within the American legal framework. As American society and the reality of warfare continue to develop, the United States must carefully chart its path forward to safeguard both the liberties vested in this society and the security through which they are allowed to exist.
Frequently Asked Questions:
- What are the key requirements for the president highlighted by the War Powers Resolution?
The requirements for the president outlined in the War Powers Resolution are first that the president must notify Congress of their intention to deploy Armed Forces personnel within 48 hours of deployment, including when the president is expanding troop deployment to additional combatant nations within the same conflict. The second requirement is that the use of force is expected to be terminated within 60 days, with an additional 30 day withdrawal period, unless otherwise granted authority to continue hostilities by Congress. Finally, the president is required to consult with Congress throughout the duration of involvement in hostilities, including during the period prior to deployment.
- What happens if the president does not follow these requirements?
Despite the fact that the War Powers Resolution is federal law, presidents historically have sought to work around or ignore the resolution altogether. Justifications for this reaction typically include citing the commander in chief powers outlined in the Constitution or arguing that the resolution is unconstitutional. The Supreme Court however, has never considered the constitutionality of the resolution despite arguments of unconstitutionality, allowing the requirements of the resolution to exist without confirmation of either argument. Regardless, the resolution does grant Congress a potential legal framework to force the removal of troops, although this has never been used and would be very difficult to achieve due to political factors.
- What are the requirements for the president in an Authorized Use of Military Authority (AUMF)?
When using an AUMF, the president is granted broad powers without most of the requirements imposed by Congress in the War Powers Resolution. The most notable difference is that there are no time limits to the validity of the AUMF, with the only two created in 2001 and 2002 still being in effect and currently in use. Additionally, the authorization does not limit the ability of the president to expand involvement of hostilities into new countries, as the authority given in an AUMF can be used for both state (e.g. Iraq and 2002 AUMF) and non-state threats (e.g. 9/11 conspirators and 2001 AUMF). The requirement that was kept within the structure of the AUMFs was the responsibility to keep Congress informed of conditions in the conflict.