WASHINGTON – Iran is reportedly planning a system to extract up to $40 billion annually in fees from ships transiting the Strait of Hormuz, prompting a sharp warning from the U.S. government that such a move would constitute a “red line.”
Secretary of State Marco Rubio characterized the proposed charges as a “fantasy” and warned that any attempt to impose tolls on the critical oil chokepoint would imperil ongoing diplomatic efforts to secure a peace deal between Washington and Tehran.
The dispute centers on Iranian proposals to implement mandatory insurance requirements and other payment methods for vessels navigating the strait. Rubio stated that the U.S. would view any such payment-regardless of whether it is labeled a fee, toll, or donation-as an illegal toll.
“Fees and tolls are the same thing to me. If you’re paying someone to go there, I don’t care if you call it a fee or a toll or a donation; it’s a toll. That’s how we’re going to define it,” Rubio told reporters in Bahrain.
Strait of Hormuz Toll Proposal
Reports indicate that Tehran has estimated that charging for security and environmental-related services for passage through the Strait of Hormuz could net the Islamic Republic $40 billion per year. Iranian officials, according to diplomatic cables, have framed the idea as a way to recover the costs of policing smuggling and protecting shipping lanes, although no formal mechanism has been published.
The Strait of Hormuz is one of the world’s most vital maritime corridors, with nearly a fifth of the world’s seaborne oil supplies flowing through the passage annually. Any disruption or additional cost imposed on traffic through the narrow waterway is closely watched by global energy markets and by governments that rely on stable sea lines of communication.
Under international maritime law, including the transit passage regime set out in the U.N. Convention on the Law of the Sea, coastal states have limited room to restrict commercial navigation in such straits during peacetime. U.S. officials argue that a unilateral Iranian tolling system would run counter to those norms and could invite legal challenges from flag states and shipping companies.
Rubio warned that the proposal is fundamentally unworkable due to the risk of military escalation.
“Let’s say a ship says, ‘I’m not going to pay the fee.’ It’s not like a toll on the road. You don’t get a ticket in the mail. You get shot at. You sink one ship, not one other ship is going to move,” Rubio said. “So you might as well abandon the fantasy now.”
Diplomatic Timeline and Red Lines
The current tension arises as the U.S. and Iran navigate a memorandum of understanding signed by President Trump. Under the terms of the agreement, the Islamic Republic agreed to allow safe passage through the straits without charge for a period of 60 days, while both sides pursued a broader de-escalation framework involving maritime security and nuclear talks.
This 60-day window was established to facilitate negotiations for a final agreement. However, the prospect of Iran imposing fees after this period expires has created a new point of contention, injecting uncertainty into a process already strained by mutual mistrust and domestic political pressure in both capitals.
Rubio emphasized that while the U.S. is committed to diplomacy, it will not accept any arrangement that grants a single country control over the straits or allows Tehran to convert a global transit route into a national revenue stream.
“We want a deal but not at any price. We will not accept a situation where the Strait of Hormuz belongs to any country … [but] we’re going to give diplomacy every chance to work,” Rubio said, calling the toll plan a test of whether Tehran is serious about de-escalation.
Senate War Powers Dispute
Concurrent with the diplomatic standoff, President Trump secured a reversal in the Senate regarding his authority to conduct military operations against Iran, underscoring how the toll dispute has become entangled with domestic debates over the use of force.
On Tuesday, the Senate initially voted to rein in the president’s ability to attack Iran under the War Powers Act, the post-Vietnam statute that requires presidents to seek congressional authorization for sustained military hostilities. The move led to a heated confrontation between Trump and Senate Republicans during a Wednesday lunch meeting.
According to Sen. John Kennedy (R-La.), the president was “mad as a murder hornet” over the initial vote, arguing that the resolution weakened his leverage during negotiations with Tehran. Sources indicated that the meeting was dominated by the president, who engaged in a shouting match with Sen. Bill Cassidy (R-La.) and criticized Sen. Dave McCormick (R-Pa.) for missing the vote.
Following a White House briefing in the Situation Room, Sen. Bill Cassidy (R-La.) and Sen. Rand Paul (R-Ky.) reversed their positions, telling colleagues that constraining the commander in chief at a moment of potential confrontation in the Strait of Hormuz could send the wrong signal to Iran’s leadership.
Senate Vote Shift on Iran Resolution
- Initial Vote: 50-48 against limiting the president’s Iran war powers
- Revised Vote: 50-47 in favor of preserving existing authority
The reversal was described by Senate aides as a symbolic move to reduce tensions between the White House and the Senate, and it does not technically alter the earlier war powers resolution the chamber had previously greenlit. But it gives the administration fresh talking points as it insists it retains flexibility to respond if Iran attempts to enforce a toll by force against commercial shipping.
President Trump announced the result on Truth Social, stating: “Wow! The Senate just changed its vote on Iran from 50-48 against, to 50-47 for. Rand Paul and Bill Cassidy changed. Thank you to [Majority] Leader John Thune, Lindsey Graham [R-SC], Bernie Moreno [R-Ohio], and all. This vote puts Iran on notice!” The White House has also privately pointed to the vote as evidence that Congress remains broadly supportive of maintaining U.S. naval freedom-of-navigation operations, including in strategic chokepoints such as the Strait of Hormuz and the nearby Strait of Malacca, should commercial traffic come under threat.
