Trump’s Iran Strikes, Not a War, No Congressional Approval Needed

 

Liberals in the U.S., including Democratic lawmakers such as Sen. Tim Kaine, are calling President Trump’s strikes on Iran “an illegal war.” In opposition, Kaine is leading a War Powers resolution to halt the operation.

First, Senator Kaine is mistaken because there is no war with Iran. the United States has not declared war on Iran. The last formal U.S. declaration of war was against Romania, Bulgaria, and Hungary in 1942. Every military conflict since then, including Korea, Vietnam, the Gulf War, Iraq, and Afghanistan, was conducted under an Authorization for Use of Military Force or executive authority, not formal declarations of war.

The Trump administration’s actions against Venezuela in January 2026 and Iran in February have been justified primarily through Article II of the U.S. Constitution and existing counter-narcotics and counter-terrorism legal frameworks, rather than a formal declaration of war by Congress. The U.S. has not declared war on Iran, and neither has Iran declared war on the U.S. Consequently, it cannot be an illegal war.

The next argument Democrats are making is that President Trump did not obtain congressional approval for the strikes. However, under the War Powers Resolution, the president does not need congressional approval. Congress passed the War Powers Resolution in 1973, over President Nixon’s veto, to reassert its constitutional authority over military commitments.

Its key provisions require that the president notify Congress within 48 hours of committing forces to hostilities, that military action cease within 60 days unless Congress formally declares war or authorizes the action, and that Congress may pass a concurrent resolution to force withdrawal.

The 48-hour notification requirement has been satisfied. President Trump notified Congress within the required window.

Operations began February 28, 2026. The 60-day clock runs to approximately April 29, 2026. President Trump is currently on Day 4.

Under the 90-day total window, including the 30-day withdrawal period, the deadline would be approximately May 29, 2026.

A War Powers resolution may be introduced, but the president can veto it and continue the operation.

Every president since Truman has pushed back on congressional war-powers constraints, typically arguing that the commander-in-chief authority gives the president inherent power to use military force to protect national security. This is not new. Congress has failed to meaningfully constrain presidential war-making since 1973. Presidents have committed forces to Korea, Vietnam, Kosovo, Libya, Syria, Somalia, and dozens of other conflicts with minimal or no formal congressional authorization. Congress has repeatedly failed to enforce its own War Powers Resolution because members are reluctant to be seen as “against the troops” once operations begin, and the political cost of stopping a war in progress is high.

The executive branch has argued that provisions of the 1973 War Powers Resolution are themselves unconstitutional, a position many executive-branch lawyers have held. The provision most consistently challenged is the concurrent-resolution mechanism. The Supreme Court’s 1983 ruling in INS v. Chadha found that simple and concurrent resolutions approving or disapproving executive action are unconstitutional because they do not require presentation to the president.

A War Powers resolution to halt military action passes with a simple majority in both chambers. President Trump can veto it. Overriding that veto would require a two-thirds majority in both chambers, an extremely high bar given current Republican control of Congress.

Even if such a resolution were to pass, it would almost certainly be vetoed, and that veto would almost certainly be sustained. In practical terms, the resolution would be largely symbolic, a formal statement of congressional disapproval rather than a mechanism capable of stopping the operation.

Another argument critics raise is that, under an originalist reading of the Constitution, congressional approval is required for such use of force abroad. However, originalism is only one school of legal interpretation among several. It carries no more inherent authority than a living-constitutionalist reading or any other interpretive framework.

There is also strong precedent supporting the president’s interpretation of the Constitution, as every U.S. military action since 1942 has occurred without a formal declaration of war.

The final argument comes from abroad. Multiple international-law experts say the operations violate the U.N. Charter’s prohibition on the use of force against sovereign states.

The U.N. Charter is a treaty, and while the United States is a signatory, treaty obligations and their enforcement are politically and legally complex. No international body has enforcement authority over the United States that compels compliance. The U.N. Security Council, which could theoretically authorize or condemn military action, includes the U.S. as a permanent member with veto power, meaning the U.S. can block any resolution against itself.

International-law experts expressing opinions that something violates the U.N. Charter carry no legal weight in U.S. domestic law. They are academics and commentators, not judges, legislators, or treaty arbiters with binding authority over U.S. policy.

Successive U.S. administrations of both parties have conducted military operations that could be characterized as inconsistent with Article 2(4), including Grenada, Panama, Kosovo, Iraq, Libya, and Syria, and faced no binding legal consequences. The United States has never accepted that the U.N. Charter supersedes its constitutional authority to conduct foreign policy and military operations as the executive branch determines necessary.

U.S. Democrat lawmakers, international-law experts, and the U.N. are free to say what they wish about the strikes, but for those involved, the outcomes have been positive. Much of the Iranian diaspora and large segments of the population inside Iran are reportedly relieved that the ayatollah is gone. Saudi Arabia has expressed support for U.S. action, and terrorist groups such as Hamas, the Houthis, and Hezbollah are losing their primary patron. That loss of support could reduce their capacity to carry out terrorist attacks.

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