The Trump Team’s Five Biggest Miscalculations About the Iran War

Washington expected force to produce clarity. Instead, the Iran war has produced something far more dangerous: a conflict whose military objectives, diplomatic endpoint and economic consequences have become increasingly difficult to control.

When the United States entered the confrontation, the Trump administration projected confidence that overwhelming American military power could rapidly weaken Tehran, protect strategic shipping routes and force Iran into accepting tougher terms. The underlying theory appeared straightforward: strike hard enough, demonstrate escalation dominance and then negotiate from a position of strength.

Months later, that theory is under intense scrutiny.

Iran’s government remains in place. Tehran has retained the ability to impose costs on American forces, Gulf infrastructure and international shipping. The Strait of Hormuz has repeatedly returned to the centre of the crisis. Attempts to establish a durable ceasefire have struggled, while renewed attacks have repeatedly undermined diplomatic progress. Meanwhile, higher energy prices, shrinking American weapons inventories and growing political unease have expanded the conflict far beyond its original military calculations.

This does not mean that every American objective has failed, nor does it prove that Iran has achieved a strategic victory. The United States has inflicted serious damage, disrupted Iranian operations and demonstrated formidable military reach. However, military damage is not the same as political success.

The central question is no longer whether Washington can strike Iran. It clearly can. The harder question is whether those strikes can produce a stable outcome at an acceptable cost.

Five assumptions now stand out as the Trump team’s most consequential potential miscalculations.

1. Assuming the War Would Be Short

The first and most fundamental assumption was that the conflict could be contained within a relatively brief military campaign.

American officials appeared to believe that intense pressure would quickly destroy or severely weaken Iran’s ability to resist. The expectation was not necessarily that every threat would disappear immediately, but that Tehran would soon conclude that continued confrontation was more costly than compromise.

That calculation underestimated the difference between destroying physical targets and breaking a government’s political will.

Iran has spent decades preparing for conflict with a technologically superior adversary. Its strategy has never depended exclusively on winning conventional battlefield engagements. Instead, it has developed missiles, drones, dispersed command structures, maritime disruption capabilities and regional relationships designed to survive an initial assault and prolong the costs of war.

Four months into the conflict, Reuters described the confrontation as a stalemate, with Tehran still resisting and the Strait of Hormuz remaining central to negotiations. Earlier reporting also noted that some analysts believed Trump had initially expected Iran to collapse under pressure more quickly than it did.

A short campaign also required a clearly defined endpoint. That endpoint has repeatedly shifted.

Was the objective to destroy Iran’s nuclear capabilities? Prevent Tehran from rebuilding them? Reopen the Strait of Hormuz? Weaken the Islamic Revolutionary Guard Corps? Force political change? Secure a new nuclear agreement? End Iranian attacks on American partners?

Each goal demands a different strategy. Destroying facilities can be accomplished through military action. Achieving permanent nuclear restrictions requires inspection, enforcement and diplomacy. Protecting shipping requires a sustained naval presence. Transforming Iran’s regional behaviour could take years.

When goals multiply, wars become harder to end because the government cannot easily declare success while major objectives remain unresolved.

The administration has tried to balance two competing messages: that American power is inflicting decisive damage, and that the United States does not seek an unlimited war. But every renewed exchange of attacks makes that distinction more difficult to maintain.

The greatest danger of the “short war” assumption is therefore not simply that the fighting lasted longer than anticipated. It is that Washington entered a conflict without a durable political mechanism for converting military pressure into a reliable peace.

2. Underestimating Iran’s Ability to Retaliate

The second miscalculation was the apparent expectation that Iran would rapidly lose the capacity—or the willingness—to impose significant costs.

American and allied strikes damaged Iranian military infrastructure, but Tehran did not need to match the United States weapon for weapon. It needed only to demonstrate that escalation would remain expensive, unpredictable and politically uncomfortable.

Iran’s response has included pressure on shipping, attacks connected to Gulf infrastructure and threats against American military positions in the region. In July, new exchanges involved reported attacks on facilities and military sites in Bahrain and Kuwait, followed by additional American strikes. The renewed confrontation contributed to the collapse of an already fragile ceasefire.

This illustrates an important feature of asymmetric warfare: the weaker power does not have to defeat the stronger one outright. It must survive, retain enough capability to respond and prevent its opponent from achieving an inexpensive victory.

Iran’s geography strengthens that strategy.

The country sits beside one of the world’s most important energy corridors. It possesses a long coastline, hardened military sites and multiple ways to threaten maritime traffic. Even degraded forces can create uncertainty for tankers, insurers, port operators and governments.

The ability to create uncertainty may be more strategically valuable than the ability to control the entire waterway. Shipping companies do not need proof that every vessel will be attacked. The possibility of disruption can be enough to delay departures, increase insurance premiums, alter routes and move global prices.

Iran has also benefited politically from simply remaining intact. Tehran’s leaders have presented their survival under sustained pressure as evidence of resilience. AP reported in June that Iranian officials were projecting confidence after the government endured weeks of American and Israeli strikes, while believing that disruption in Hormuz gave Tehran continuing leverage.

Washington may have correctly predicted that Iran would suffer extensive military damage. The larger error was assuming that damage would automatically eliminate Tehran’s capacity to shape the conflict.

3. Misjudging the Strait of Hormuz

The third potential miscalculation concerns the Strait of Hormuz.

Before the war, approximately one-fifth of global oil supplies passed through this narrow maritime corridor. That made Hormuz not simply a regional military issue but a pressure point connecting the battlefield to petrol stations, factories, airlines and household budgets around the world.

Any strategy involving Iran should therefore have treated the strait as a central scenario rather than a secondary risk.

Yet the conflict repeatedly demonstrated how difficult it is to guarantee safe passage through a contested maritime zone. Naval escorts and airstrikes can reduce threats, but they cannot remove every missile, drone, mine, small vessel or coastal system. Nor can military operations instantly restore commercial confidence.

Even when the physical supply of oil remains adequate, traders react to risk. On July 14 and 15, Reuters reported renewed increases in oil prices as American and Iranian attacks escalated and shipping through Hormuz slowed. Brent crude rose above $85 per barrel amid concerns about further disruption.

The problem is especially serious because Washington’s objectives can conflict with each other.

The United States wants to weaken Iran economically, restrict Tehran’s exports and protect international commerce. However, military actions that disrupt Iranian shipping or intensify confrontation around the strait may also increase global energy prices. Higher prices can hurt American consumers while potentially raising the value of whatever oil Iran or other sanctioned producers still manage to sell.

Hormuz therefore gives Tehran a form of leverage that cannot be eliminated through air power alone.

The administration has periodically presented new maritime proposals and pressure measures, but shifting policies can increase market uncertainty. Markets prefer predictable rules. A strategy that changes between blockade threats, shipping charges, military escorts and diplomatic bargaining may encourage traders to price in continued instability.

The miscalculation was not necessarily believing the United States could eventually protect the waterway. It was underestimating how much time, force and economic disruption that task could require.

4. Expecting Military Pressure to Produce a Better Deal

The fourth questionable assumption was that battlefield pressure would compel Tehran to accept an agreement clearly favourable to Washington.

This theory has a long history in international politics. A state uses force to weaken an adversary, then offers negotiations before the adversary can recover. In principle, the stronger party enters talks with greater leverage.

In practice, coercive diplomacy works only when several conditions are met. The adversary must understand what it needs to do. It must believe compliance will end the punishment. It must trust that the stronger party will honour the agreement. Most importantly, the demands must appear less dangerous than continued resistance.

Those conditions have been difficult to establish in the Iran conflict.

Negotiations have continued through intermediaries and temporary understandings, but ceasefires have repeatedly faced disputes over implementation. Reuters reported in June that proposed terms appeared to give Tehran several things it had sought, while Washington’s clearest potential gain was the reopening of the strait. Critics argued that the emerging framework risked strengthening Iran’s regional position rather than producing the decisive settlement originally expected.

That outcome reflects a paradox.

The more difficult the war becomes for the United States, the more urgently Washington may want an agreement. But the more urgently Washington wants an exit, the less pressure Iran may feel to concede.

Tehran can also calculate that endurance improves its bargaining position. If Iranian leaders believe American voters, markets and political institutions are less tolerant of a long war, they have an incentive to delay, resist and seek better terms.

The conflict has consequently blurred the line between coercion and entrapment. Military action was intended to create negotiating leverage. Instead, the need to stop the fighting may have created leverage for both sides.

A deal may still emerge. It could include nuclear restrictions, maritime commitments, inspections and security guarantees. But any durable agreement will require compromises that are more complex than the original image of Iran simply surrendering under pressure.

The central miscalculation was treating negotiation as the automatic final stage of military dominance. Diplomacy is not simply a ceremony held after the bombing ends. It is a separate contest shaped by credibility, timing, domestic politics and each side’s willingness to continue suffering.

5. Underestimating the Economic, Military and Political Cost

The fifth miscalculation may prove the most damaging over time: the belief that the United States could absorb the conflict’s wider costs without serious consequences.

The economic effects begin with energy.

Rising oil prices can feed through to petrol, transportation, manufacturing, food distribution and aviation. They can complicate efforts to control inflation and place additional pressure on central banks. For Britain and Europe, which remain exposed to global energy markets, prolonged instability can weaken growth and increase household costs. For the United States, higher petrol prices are both an economic and political problem because voters encounter them directly.

The military costs are also becoming clearer.

AP reported that the war had reduced American stocks of Tomahawk cruise missiles and Patriot and THAAD interceptors. Replacing sophisticated weapons is expensive and slow, and expanding production capacity can take years. The issue is not merely whether America has enough weapons for Iran. It is whether prolonged expenditure reduces readiness for another crisis, particularly in Europe or the Indo-Pacific.

Every interceptor used against an Iranian missile is one that must eventually be replaced. Every naval deployment increases maintenance demands. Every extended operation creates personnel, logistics and opportunity costs.

This matters because American military planning does not occur in isolation. Washington must simultaneously consider China, Russia, North Korea, terrorism, alliance commitments and support for partners. A war that consumes specialised munitions can narrow the choices available in future emergencies.

The political costs may be equally significant.

Trump built much of his political identity around opposing prolonged American involvement in costly foreign wars. A conflict without a clear endpoint therefore creates a contradiction between the administration’s “America First” message and the realities of sustained military engagement.

Reuters reported that the absence of a clear exit strategy posed risks to Trump’s legacy and to Republicans approaching the November 2026 midterm elections. Renewed fighting, rising petrol prices and continued American deployments could make the war increasingly difficult to separate from domestic political debate.

Supporters of the administration can argue that retreat would be even more costly. They may contend that allowing Iran to threaten shipping, rebuild nuclear capabilities or attack American partners would damage U.S. credibility and produce a more dangerous Middle East.

That argument deserves consideration. The United States faces real threats, and refusing to respond also carries consequences.

But recognising the dangers of inaction does not validate every assumption behind military action. The relevant test is whether the chosen strategy produces a better and more sustainable outcome than the alternatives.

A War of Power Without Control

The central lesson of the Iran conflict is that overwhelming military power does not guarantee political control.

The United States can destroy targets, intercept missiles and deploy forces across the region. What it cannot easily do is determine how Iran will respond, how markets will react, whether allies will cooperate or when Tehran will decide that compromise is preferable to resistance.

That gap between capability and control has defined many modern conflicts.

The Trump administration’s five possible miscalculations were interconnected. Expecting a short war encouraged confidence that retaliation would be manageable. Underestimating retaliation led to insufficient attention to Hormuz. Misjudging Hormuz understated the economic cost. Underestimating the cost increased the urgency of negotiations. That urgency potentially weakened Washington’s ability to demand an unambiguously favourable settlement.

The result is a strategic loop: military escalation is used to improve negotiating leverage, but each escalation also increases the need for a deal.

None of this means Iran has escaped without enormous damage. Nor does it mean Washington cannot eventually secure important concessions. Outcomes remain uncertain, and negotiations could still produce restrictions that materially improve regional security.

However, the administration’s original confidence has collided with a harsher reality. Iran did not need to defeat the United States. It needed to deny Washington a quick, inexpensive and politically uncomplicated victory.

So far, it appears to have done exactly that.

The most important question is therefore not which side can launch the next strike. It is whether the Trump administration can define an achievable end state—and reach it before military depletion, economic disruption and domestic political pressure become more powerful than the leverage the war was supposed to create.