President Trump 's decision to suspend a controversial maritime law during the Iran war has made it easier to ship oil across the U.S. — and now he wants to keep it that way, according to U.S. officials.

Why it matters : Known as the Jones Act , the 1920 law raises the cost of shipping between U.S. ports because it requires goods to be carried on American-flagged vessels, which are in relatively short supply compared to the global supply.

Trump issued a 60-day waiver from the law on March 18 to make shipping oil easier in response to rising fuel prices from the Iran war.

Zoom in : Since then, 40 tankers have been able to deliver oil —or are in the process of doing so— between U.S.…