Operation Epic Fury Explained: Trump’s 7 Shifting Justifications for the Iran War

January 2026 — The Protest Rationale: Beginning in late December 2025, massive anti-government protests erupted across Iran — described as the largest since the 1979 Islamic Revolution, driven by economic collapse, currency devaluation, and rising food prices. The Iranian government responded with lethal force.

On January 2, 2026, Trump posted on Truth Social: “If Iran shoots and violently kills peaceful protesters, which is their custom, the United States of America will come to their rescue. We are locked and loaded and ready to go.” A fortnight later, he told protesters to “keep protesting” and that “help is on its way.” Many observers interpreted these posts as establishing a red line — if Iran killed protesters, the US would intervene militarily.

February 24 — State of the Union: Trump stated Iran had “restarted its nuclear program” and was “working to build missiles that will soon reach the United States.” These claims, according to multiple intelligence sources cited by CNN, overstated Iran’s actual capabilities. The Defense Intelligence Agency (DIA) had concluded in 2025 that Iran would need until approximately 2035 to develop intercontinental ballistic missiles (ICBMs) capable of reaching the US.

February 25 — Iran says deal is within reach: A day after Trump’s State of the Union, Iranian Foreign Minister Abbas Araghchi stated that a “historic” agreement to avert military conflict was “within reach” ahead of renewed Geneva talks. Negotiations were actively underway.

February 28 — Strikes begin anyway: Despite active negotiations — and just three days after Araghchi’s statement — the US and Israel launched coordinated strikes. Khamenei was killed. The war began.

Rationale 1 — Nuclear Threat (Feb 28, Trump): In his video address on the morning of strikes, Trump offered a historical indictment of Iran — citing the 1979 US Embassy hostage crisis, proxy warfare, and funding of Hezbollah and Hamas — but the primary stated reason was nuclear: Iran had “rejected every opportunity to renounce their nuclear ambitions.” The IAEA had reported hidden highly enriched uranium in an underground facility, but simultaneously stated it had “no evidence of an organised nuclear weapons programme.” Trump’s special envoy Steve Witkoff claimed Iran was “probably a week away” from nuclear bomb-making material — a claim intelligence officials said was significantly overstated.

Rationale 2 — Imminent Threat / Preemption (Mar 1, Leavitt): White House Press Secretary Karoline Leavitt used the language of imminent threat — the same framework used to justify the 2020 killing of Iranian General Qasem Soleimani. The US needed to act while Iran was weakened — it was “our last, best chance.” However, Pentagon briefers privately acknowledged to congressional staff that Iran had not been planning to strike US forces unless Israel attacked Iran first — directly undercutting the “imminent” claim.

Rationale 3 — Israel’s Trigger (Mar 2, Rubio): Secretary of State Marco Rubio briefed reporters before a classified Capitol Hill session with a notably different account: “We knew that there was going to be an Israeli action. We knew that that would precipitate an attack against American forces, and we knew that if we didn’t preemptively go after them before they launched those attacks, we would suffer higher casualties.” The implication: the US went to war because Israel was going to strike Iran regardless, and the US acted to pre-empt the Iranian retaliation that would have followed. Critics immediately noted this made Israel’s decision the proximate cause of American military action.

Rationale 4 — Iran Was Going to Strike First, Unprompted (Mar 3, Trump): One day later, Trump publicly contradicted Rubio. Meeting German Chancellor Friedrich Merz at the White House, he said: “It was my opinion that they were going to attack first. They were going to attack if we didn’t do it.” Adding: “No, I might’ve forced their hand” — referring to Israel. This claim — that Iran was planning unprovoked strikes against the US, independent of any Israeli action — had not previously been stated by any official, and directly contradicted both Rubio’s account and the Pentagon’s private briefing to Congress.

Rationale 5 — Destroying the Conventional Shield (Mar 2–3, Hegseth): Defence Secretary Pete Hegseth, alongside Joint Chiefs Chairman General Dan Caine, offered a more technical argument: Iran was building “powerful missiles and drones to create a conventional shield for their nuclear blackmail ambitions.” Even if Iran’s nuclear programme was not immediately ready, its conventional missile arsenal functioned as a deterrent protecting that programme. Eliminating the shield was therefore necessary. Critics noted Iran had possessed a substantial missile arsenal for years — this rationale would have justified strikes at any point in the previous decade.

Rationale 6 — Regime Change (Mar 1–6, multiple speakers): The most sweeping justification emerged across multiple statements. On Day 1, Trump called for Iran to have “GREAT & ACCEPTABLE Leader(s).” By March 3, combat would continue “until all of our objectives are achieved.” By March 6, Truth Social: “There will be no deal with Iran except UNCONDITIONAL SURRENDER! After that, and the selection of a GREAT & ACCEPTABLE Leader(s)…” Yet when pressed, the administration simultaneously insisted: “This is not a so-called regime change war — but the regime sure did change.”

Rationale 7 — A Feeling (various): Asked to define the specific intelligence that triggered the timing of the strikes, Trump’s answer — as reported by PBS and the Associated Press — was that he had “a feeling” Iran was about to attack.

US Domestic Law — The War Powers Resolution (1973): The War Powers Resolution requires the President to notify Congress within 48 hours of committing forces to armed conflict, and limits engagement to 60 days without explicit congressional authorisation. Following the Iran strikes, both the House and Senate voted on resolutions to invoke the War Powers Resolution. Both resolutions failed, largely along party lines — Republicans voted against, Democrats for. Speaker Mike Johnson called a war powers vote “dangerous.”

International Law — the UN Charter: Under Article 2(4) of the UN Charter, states are prohibited from using force against the territorial integrity of any other state. The two recognised exceptions are: action authorised by the UN Security Council under Chapter VII, and self-defence under Article 51 in response to an armed attack. No UNSC resolution authorised the Iran strikes. UN Special Rapporteur on Human Rights and Counter-terrorism Ben Saul stated Iran had not enriched uranium to the level required for a nuclear device and the case was “nowhere close to being self-defence against an imminent attack.” Professor Don Rothwell (ANU) stated there was no legal basis under international law. NATO Secretary-General Mark Rutte and the Centre for European Policy Analysis argued the strikes were “probably” legal — reflecting the ambiguity when a major power acts.

The Law Society Journal specifically noted that striking Iran during active negotiations violated the principle of good faith under Article 2(2) of the UN Charter — a nuanced legal argument that is exam-relevant.

Multiple analysts have drawn comparisons between Operation Epic Fury and the 2003 US invasion of Iraq under President George W. Bush — when the stated justification (weapons of mass destruction / WMDs) later proved inaccurate, and the stated goals shifted over time from WMD elimination to counter-terrorism to democratisation.

The parallel is imperfect but the structural pattern is recognisable: a US administration overstating intelligence, offering shifting rationales, and acting before the diplomatic process was exhausted. In both cases, legal frameworks were stretched or bypassed. In both cases, dissenting voices — including within the President’s own party — raised concerns before or during the conflict. In the Iraq case, the intelligence failure became clear over months. In the Iran case, the contradictions were visible within days.

The analytical difference: the Iraq WMD claim was presented with apparent confidence and later disproven by subsequent investigation. The Iran justifications shifted in real time, with officials contradicting each other within 24 hours — making the incoherence immediately visible rather than retrospectively uncovered.

Casus belli: Latin — “cause of war.” The stated justification or provocation used to justify initiating armed conflict. In Operation Epic Fury, at least six separate casus belli were offered.

Preemption: Striking first against an attack that is imminent — meaning it is about to happen immediately. Under international law, preemption against a genuinely imminent attack can qualify as self-defence under Article 51 of the UN Charter. The Leavitt/imminent threat rationale attempted to invoke this framework.

Prevention: Striking first against a future threat — one that is not yet imminent but might materialise over time. Prevention is significantly more legally contested than preemption under international law. The “conventional shield” and “nuclear threat in 2035” rationales fall closer to prevention than preemption.

Regime change: Using military force to overthrow a foreign government. Not legally recognised as a valid justification for war under international law. The Trump administration’s “unconditional surrender” and “GREAT & ACCEPTABLE Leader(s)” language constitutes regime change framing — even as officials simultaneously denied it was a “regime change war.”

War Powers Resolution (1973): A US Congressional statute — not a constitutional provision — requiring presidential notification to Congress within 48 hours of committing forces to armed conflict, and limiting unauthorised engagement to 60 days. Historically, presidents have questioned its constitutionality while nominally complying with its notification requirement.

Article 51, UN Charter: The self-defence exception to the general prohibition on use of force. Applies to “armed attacks” — its scope in anticipatory or preemptive scenarios remains debated in international law scholarship.