President Donald Trump has temporarily suspended enforcement of the Jones Act, a century-old law requiring that goods transported by water between U.S. ports travel on vessels that are American-built, owned, and crewed. The decision comes amid ongoing tension with Iran, which has threatened shipping lanes in the Strait of Hormuz, a key maritime chokepoint for global oil supplies.

Under the waiver, which was initially set for 60 days and extended by 90 days late last month, foreign-flagged vessels have been allowed to transport cargo between U.S. ports. The Maritime Administration reported that as of April 30, about two dozen such voyages had been completed. Examples include a Singapore-flagged ship carrying 322,000 barrels of gasoline blend stock from Texas to California, a Maltese-flagged tanker delivering 300,000 barrels of Bakken crude oil from Texas to Pennsylvania, and another Singaporean vessel transporting 300,000 barrels of gasoline from Louisiana to Florida. These shipments have been described as critical for maintaining the flow of energy products amid disruptions caused by Iran’s blockade efforts.

White House officials characterized the waiver as a success, citing new data suggesting that the suspension has allowed more supplies to reach U.S. ports more quickly. “This extension will help ensure vital energy products, industrial materials, and agricultural necessities are maintained,” a White House spokeswoman said.

The Jones Act, formally known as the Merchant Marine Act of 1920, has long been a subject of debate. Proponents argue that the statute supports American maritime industries and national security by protecting the U.S. shipbuilding sector and maintaining a domestic merchant fleet. Critics contend that the law restricts competition, raises shipping costs, and limits the flexibility of supply chains, particularly during crises or natural disasters.

Opponents also highlight economic inefficiencies stemming from the law’s constraints, pointing to cases where cargo that could be shipped via water is forced onto rail or trucking, increasing logistics costs. They note instances such as Puerto Rico’s reliance on natural gas imports from abroad rather than from the U.S. mainland as symptomatic of the law’s unintended consequences.

While some beneficiaries of the Jones Act’s protections remain firmly supportive, the current temporary suspension under the Trump administration has reignited discussions over whether broader reform or repeal could enhance supply chain resilience and reduce costs. The administration’s extension of the waiver amid heightened geopolitical risks suggests an openness to reevaluating longstanding maritime policies, though any permanent changes would require congressional action.