Iran's parliament is reviewing a plan to bar ships linked to the United States, Israel and other countries it regards as hostile from transiting the Strait of Hormuz, and to charge such countries a fee before they are allowed to use the waterway.
The proposal is tied to a broader deal under discussion between Iran and Oman to jointly manage the strategic strait. The agreement is seen as central to hopes that Hormuz can be reopened and energy flows restored after they were disrupted by a US and Israeli attack on Iran in February.
The text of the plan is now under review in Iran's parliament, according to semi-official reports. The Trump administration has rejected the proposal.
The Strait of Hormuz is a critical shipping lane for global oil supplies, making any restrictions on vessel traffic there a matter of international concern.