The Constitution grants Congress the sole power to declare war, yet modern presidents have increasingly asserted broad authority to use military force without prior congressional approval. Last week, lawmakers voted down a resolution to halt President Trump's military action against Iran, continuing a pattern that political historians say dates back decades.
The White House released video on Feb. 28 of President Trump discussing strikes on Iran. The administration has defended the action as necessary to address what it calls a real threat, while Democrats have challenged the legality of the strikes without congressional authorization.
What the Left Is Saying
Democrats have led the push to require congressional approval for military action. Sen. Tim Kaine, D-Va., has been a consistent voice on war powers, saying: "We shouldn't be at war without a debate or vote. That is what the framers intended."
Progressive lawmakers argue that bypassing Congress undermines democratic accountability and violates the constitutional separation of powers. They point to the War Powers Resolution of 1973 as the legal framework that should govern military deployments.
Some Democrats have called for more aggressive oversight, arguing that presidents of both parties have exceeded their constitutional authority. The party's progressive wing has criticized what they see as a systematic erosion of Congress's war-making power across multiple administrations.
What the Right Is Saying
Secretary of State Marco Rubio has defended Trump's Iran strikes, telling reporters after briefing lawmakers: "We've overcomplied with the law and what it requires. This is an action by the president to address a real threat."
Republicans have largely supported presidential authority on military matters, citing the president's role as commander in chief. Many argue that requiring congressional approval for every military operation would hamstring the executive branch's ability to respond quickly to emerging threats.
Conservative commentators have echoed this sentiment, arguing that modern warfare requires flexibility that the constitutional framework established in 1787 did not anticipate. They note that both Democratic and Republican presidents have used military force without explicit congressional authorization.
What the Numbers Show
The last time a president asked Congress for a formal declaration of war was President Franklin D. Roosevelt in World War II, according to Columbia University law professor Matthew Waxman. Since then, presidents have deployed forces without explicit authorization.
The 1973 War Powers Resolution requires the president to notify Congress within 48 hours of introducing U.S. forces into hostilities and mandates withdrawal within 60 days without congressional authorization. However, the law has not prevented unilateral military action.
Presidents have ordered strikes without congressional approval in multiple conflicts: Bill Clinton in Kosovo, Barack Obama in Libya, Donald Trump in Syria, Joe Biden in Yemen, and now Trump again in Iran. Yale law professor Oona Hathaway notes that current conflicts involve more than a dozen countries.
The Bottom Line
The balance between presidential and congressional war powers remains contested, with courts largely avoiding weighing in on the debate. As Hathaway notes, "James Madison describes checks and balances as ambition checking ambition," yet Congress has generally been passive in asserting its constitutional authority.
For now, most Republicans and a few Democrats support the administration's position. However, that calculus could shift if current conflicts stretch on and the human and financial costs increase. What to watch: whether Congress attempts further oversight measures and how public opinion shifts as conflicts continue.
The framers established a system where Congress declares war and the president commands forces, but interpreting that division in practice has proven complex. As military operations expand across multiple regions, the tension between executive urgency and legislative oversight shows no signs of resolution.