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Can a president threaten strikes against another country to protect that country’s own citizens from their government? The answer from experts is nearly unanimous: No. Congress must authorize it. The UN Security Council must approve it. A president’s personal sense of morality doesn’t provide authority.
The Constitution’s War Powers Allocation
The framers were obsessive about preventing presidents from dragging the country into wars on executive whim. They’d fought a revolution against a king who could declare war unilaterally, and they designed the Constitution to prevent that concentration of power.
Alexander Hamilton made this explicit in Federalist 69: the president’s power to command the armed forces was limited compared to the British monarch’s war powers. The king could declare war. The American president could only execute wars that Congress had declared.
James Madison put it more bluntly at the Constitutional Convention. Giving one person both the power to declare war and wage it would create “a prince.” It would recreate the British monarch from whose authority the colonies had seceded.
Yet here we are, 235 years later, with presidents routinely asserting the kind of unilateral authority the Constitution was designed to prevent.
The War Powers Resolution of 1973 was Congress’s attempt to claw back some control. It requires presidents to notify Congress within 48 hours of deploying forces and to withdraw them after 60 days unless Congress authorizes continuation. Presidents from both parties have claimed it’s unconstitutional, and none has been forced to comply when they didn’t want to.
The critical gap: the law doesn’t say whether the executive needs Congress’s permission to threaten action. Can a president plan strikes, brief the Pentagon on targets, move assets into position—all without telling Congress? Trump’s position, demonstrated by his operation kidnapping Venezuela’s president without congressional notice, is that he can do that.
International Law’s Clear Prohibition
Article 2(4) of the UN Charter states plainly that “all Members shall refrain in their international relations from the threat or use of force against a country’s borders or right to govern itself.”
Notice it says “threat or use.” Threatening action is itself illegal under the treaty, even if you never follow through.
The Charter allows force in two circumstances: when the Security Council authorizes it, or when a country acts in self-defense when facing an imminent military threat. Iran’s crackdown on protesters—brutal as it is—doesn’t threaten the United States. It’s no armed attack on American forces or territory. The administration hasn’t even claimed it constitutes a threat requiring defensive response.
Trump has framed the threatened action in purely humanitarian terms. Which means it would require either Security Council authorization (Russia and China would veto) or acceptance of the idea that countries can intervene to stop mass suffering.
How Libya Ended Humanitarian Intervention
There was, briefly, a consensus that the world community had a duty to protect populations from genocide, war crimes, ethnic cleansing, and crimes against humanity. The UN General Assembly endorsed this in 2005.
Libya killed it.
In March 2011, the Security Council authorized “all necessary measures” to protect Libyan civilians from Muammar Gaddafi’s forces. NATO took that authorization and ran with it—straight into a seven-month regime change operation involving 26,000 air strikes. The operation ended with Gaddafi’s overthrow and death. Human Rights Watch documented at least 72 civilian deaths from NATO strikes, though acknowledged difficulties in comprehensive documentation, while other sources have estimated total conflict deaths in the tens of thousands.
The mandate was to protect civilians. What NATO did was topple a government.
Russia and China learned their lesson. They’ve stated they’ll never authorize another humanitarian intervention after watching how Libya’s authorization was abused.
The principle is no longer used politically. It applied only to the most extreme atrocities: genocide, systematic war crimes, ethnic cleansing. Iran’s crackdown on protesters, while brutal and unjustifiable, doesn’t meet that threshold.
Countries limited this principle to the narrowest cases to prevent it from becoming a blank check for any intervention a powerful country wanted to justify.
Trump’s Threat in Legal Context
Trump made public statements threatening action. The Pentagon has been briefed on strike options. Multiple sources confirm officials have presented the executive with potential targets inside Iran. The administration has not notified Congress of any deployments or imminent action.
This falls somewhere between talking tough and preparing to attack. Once you’re briefing strike options and developing target lists, you’ve crossed into territory that looks a lot like the kind of preparation that should require congressional notification.
The administration’s position, based on the Venezuela precedent, appears to be that the executive can plan, prepare for, and execute operations on his own if he frames them as something other than war. In Venezuela, the administration called kidnapping a head of state a “law enforcement action supported by force.” UN Secretary-General António Guterres called it “a dangerous precedent” and worried that “the rules have been disrespected.”
Senator Tim Kaine has called for public congressional debate on the Iran threat and has sponsored war powers resolutions to limit unauthorized action. “The Constitution entrusts Congress with the power to declare war,” Kaine emphasized, arguing that Trump’s approach violates both constitutional law and treaties.
The Senate voted 52-47 to limit Trump’s Venezuela powers in January 2025, suggesting a bipartisan coalition exists for constraining presidential authority. But that vote came after the operation had already occurred.
Why Courts Won’t Intervene
You might reasonably ask: if this is illegal, can’t someone sue to stop it?
The Supreme Court has repeatedly held that certain decisions are disputes between branches of government that judges typically won’t get involved in. When Senator Barry Goldwater sued Carter for recognizing the People’s Republic of China, the Court declined to intervene, saying it was a political dispute between branches that wasn’t appropriate for judicial resolution.
Members of Congress have tried suing presidents over unauthorized action, arguing it violates Congress’s constitutional power to declare war. Courts have been inconsistent about whether Congress has the right to sue over this. Courts might say a threat that hasn’t happened yet isn’t ready for them to review, meaning judicial review of threats tends to come as after-the-fact assessment of actions already taken, rather than court orders stopping the threatened action before it happens.
Congress could demand the administration produce opinions from the government’s office explaining why the Constitution allows this. If Trump refuses, it strengthens the inference that no authority exists. If he provides analysis, Congress can evaluate whether it’s persuasive and potentially pass legislation restricting the claimed authority.
But that requires Congress to assert itself, which hasn’t been its strong suit on war powers for decades.
Historical Precedents Don’t Support Trump
Supporters of broad presidential war powers sometimes point to historical precedents: Kosovo in 1999, when NATO bombed Serbia to stop ethnic cleansing. Or Kennedy’s actions during the Cuban Missile Crisis.
Kosovo was a 78-day air campaign to stop an ongoing ethnic cleansing operation. NATO didn’t claim it had the automatic right to intervene for humanitarian purposes—countries emphasized the temporary nature of the intervention and its necessity to address an active atrocity. Critically, it didn’t result in regime change. It led to a negotiated settlement and Kosovo’s eventual independence through a process at the UN.
Most scholars characterized Kosovo as questionable at the time, justified by necessity and humanitarian urgency rather than clear authority. The intervention contributed to the weakening of rules created after World War II to limit action—the same weakening that led to Russia’s suspicion that Western powers use humanitarian language to disguise geopolitical objectives.
Kennedy’s Cuban Missile Crisis response operated in completely different circumstances. He was responding to what he credibly characterized as a threat to American national security—Soviet strategic weapons 90 miles from U.S. territory. Kennedy made conditional military threats, including a naval blockade (termed a “quarantine”) and warnings of potential further action if Soviet missiles weren’t removed, but he pursued diplomatic channels intensively throughout the crisis, ultimately reaching a negotiated settlement rather than initiating military strikes. Congress was briefed. The threat was made during an active crisis in which American security was directly threatened.
Iran’s crackdown poses no threat to American national security. It’s Iran’s treatment of its own citizens. Congress hasn’t been notified and hasn’t authorized anything.
The closest precedent is Obama’s 2013 threat to strike Syria over chemical weapons use. Obama initially asserted he didn’t need congressional authorization, claiming inherent presidential authority. But facing congressional opposition and public resistance, he ultimately requested congressional approval—which he didn’t get. Russia proposed a diplomatic alternative involving Syrian chemical weapons surrender, which Obama accepted, avoiding the strike he’d threatened.
The episode demonstrated that even a chief executive with significant constitutional expertise didn’t possess unilateral authority to conduct major operations based on humanitarian justification alone. As Senator Kaine noted, “the U.S. did not attack Syria” despite extensive chemical weapons use because the political consensus for such action didn’t exist.
Consequences for Global Stability
If the United States can unilaterally threaten and execute operations against sovereign nations for humanitarian justifications, what stops China from doing the same in Taiwan? What prevents Russia from escalating in Ukraine with similar humanitarian claims? What stops India and Pakistan from intervening in each other’s territory?
As Yusra Suedi, who teaches at the University of Manchester, explained: Trump’s approach “signals something dangerous, in that it gives permission to other states to follow…states such as China, eyeing Taiwan, or Russia regarding Ukraine.”
After World War II, countries created a system based on the idea that force should be constrained by law, rather than deployed at the discretion of whoever has the biggest armed forces. The Charter bans threats or use of force. It’s how countries tried to establish a rule-based system where action is permitted only under specific circumstances: self-defense and Security Council authorization.
Erosion of these constraints threatens to return the system to a state where force is the primary mechanism for resolving disputes. That’s what the world looked like before 1945, and it didn’t go well.
The Practical Reality
The analysis is clear, but the enforcement mechanisms are weak.
The United States isn’t subject to the International Criminal Court’s jurisdiction for crimes of aggression—we never ratified the treaty that created the International Criminal Court. The International Court of Justice could theoretically hear a case brought by Iran, but the U.S. can assert immunity. The Security Council could condemn the action, but the U.S. has veto power.
Treaties constrain superpowers mainly through political pressure: the reactions of other states, loss of trust and willingness to work with us, and precedent-setting effects on how other countries justify their own use of force. These matter, but they’re weaker than a court order or criminal charges.
Domestically, Congress has the constitutional authority to constrain presidential action. It can deny funding, explicitly prohibit use of funds for strikes against Iran, require advance authorization, or use the War Powers Resolution to force withdrawal if Trump acts on his own.
Congress has spent decades accepting presidential initiatives after the fact rather than preventing them in advance.
Representative Goodlander has championed a bipartisan war powers resolution to block unauthorized action, demanding an immediate vote. Senator Kaine has done the same in the Senate. There’s a coalition willing to challenge Trump’s claims of unilateral authority.
Whether that coalition is large enough, and willing to act before rather than after action occurs, remains to be seen.
The Legal Answer
Is threatening action to support protesters authorized?
No. The Constitution as written and originally understood doesn’t allow it. Treaties the United States has ratified don’t allow it. No existing congressional authorization covers it. The narrow humanitarian intervention principle that survived Libya’s abuse of it doesn’t cover it.
Scholar Vincent Chetail calls it “a clear violation.” Kate Vigneswaran labels it “an act of aggression.” Margaret Satterthwaite, a UN official who monitors judicial independence, calls Trump’s rhetoric “extremely dangerous” and warns it “could bring back a time when powerful countries took what they wanted.”
Constitutional scholars across the political spectrum agree that major offensive operations against sovereign nations require congressional authorization. A chief executive can respond to threats that are about to happen and operate within existing congressional authorizations. He doesn’t have authority to initiate new operations against countries that haven’t attacked us, based on his personal sense of morality.
The framers designed the Constitution to prevent this concentration of power in one person’s hands. They knew where that led. They’d fought a war against it.
Whether constraints will constrain Trump depends on whether Congress enforces its constitutional authority and whether the community imposes meaningful consequences for violations. The law itself is clear: threatening strikes against Iran to support protesters violates both the Constitution’s allocation of war powers to Congress and the international system of laws created after World War II.
The question is whether anyone with the power to stop it will do so.
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