Iran's elected parliament has formally tabled a bill on managing the Strait of Hormuz, the chamber's national security chief said on July 14, claiming US drones were shot down overnight.

Ebrahim Azizi, chairman of the parliament's National Security and Foreign Policy Commission, wrote in a post on his X account that the bill, titled the "Strategic Action for the Security and Sustainable Progress of the Strait of Hormuz and the Persian Gulf," was formally introduced in an open session of parliament overnight, coinciding with what he described as "the downing of US drones".

"We remain steadfast in defending our red lines, particularly regarding the management of the Strait of Hormuz," Azizi wrote, adding: "This is the first step; subsequent measures are forthcoming." In the Persian version of the post, he said the next steps would deprive Iran's enemies of sleep.

Azizi provided no details of the claimed drone shootdowns, including how many aircraft were involved, where they were downed or by what means, and there was no immediate comment from the US Central Command.

The commission finalised a comprehensive plan on the security and development of the Gulf and the strait in May, and Azizi has repeatedly asserted that the waterway is Iranian territory whose transit regime is for Tehran alone to determine.

Iran introduced a tolling system for commercial shipping in the strait in April, with fees payable in rials, following the partial reopening of the waterway after its wartime closure.

The tabling of the bill marks the recently reopened parliament's entry into an escalating confrontation over the strait. US President Donald Trump on July 13 declared the waterway open "with or without Iran", reinstated a blockade on Iranian shipping and announced a 20% levy on all other transiting cargo, declaring the US the "Guardian of the Hormuz Strait".

Hours later, Iran's Islamic Revolutionary Guard Corps (IRGC) said two supertankers had been struck and disabled after entering a mined corridor, an account that could not be independently verified.

The strait, which connects the Persian Gulf to the Sea of Oman between Iran and Oman, carries roughly a fifth of global oil consumption and around a third of seaborne liquefied natural gas trade.

Competing legal regimes imposed by Washington and Tehran, each claiming authority over transit, would leave shipowners, insurers and Gulf exporters navigating between a US levy and an Iranian toll under threat of interdiction from both sides.