The US president has ordered the US International Development Finance Corporation to provide political risk insurance and financial guarantees for maritime trade travelling through the Gulf.
The announcement marks one of the administration's most aggressive steps yet to contain rising energy prices and calm oil markets amid escalating conflict in the Middle East that has raised risks to shipping through key waterways.
Trump has made lower fuel costs for Americans central to his economic messaging, and the move signals a willingness to use financial and military tools to prevent disruptions to global crude supplies.
"No matter what, the United States will ensure the free flow of energy to the world," Trump said in a Truth social media post.
Trump added that more actions are coming.
Global crude prices have spiked since Israeli and US forces began striking Iran over the weekend, leading to fighting that has interrupted Middle East oil tanker shipments.
Treasury Secretary Scott Bessent and Energy Secretary Chris Wright were expected to meet with Trump on Tuesday afternoon to present a list of proposals to address the issue and finalise a response, two sources familiar with the plan told Reuters on condition of anonymity.
Trump told reporters on Tuesday that Americans may have to live with higher oil prices for a short period, "but as soon as this ends, those prices are going to drop, I believe, lower than even before".
If higher energy prices persist, they could undermine efforts by lawmakers in Trump's Republican Party to retain power in the congressional midterm elections in November.
Oil shipments have been largely blocked through the Strait of Hormuz, the narrow waterway between Iran and Oman through which around a fifth of the world's oil is shipped, with a number of tankers damaged by strikes and others stranded.
Shipping companies and insurers have begun reassessing their exposure to the region.
War-risk premiums have jumped and some providers have scaled back or withdrawn coverage, industry sources say.
Higher insurance costs have made it more expensive for tankers willing to risk travelling through the area, prompting some operators to delay voyages or seek alternative routes.
US support for tanker insurance is not unprecedented.
During the Iran-Iraq conflict in the 1980s, Washington reflagged tankers and provided naval escorts when private insurers withdrew coverage.
After the September 11, 2001, attacks, the US issued insurance policies to keep shipping moving amid elevated war-risk premiums.
Secretary of State Marco Rubio told reporters on Monday the US has a "program in place" to fight rising energy prices and that it would be implemented by Wright and Bessent.
"Starting tomorrow you will see us rolling out those phases to try to mitigate against that," Rubio said. He provided no details.
The administration has been reluctant to tap the nation's Strategic Petroleum Reserve, but officials could signal as early as Tuesday that they are prepared to use it if prices continue to climb, one source said.
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