US President Donald Trump has granted a 90-day extension to a shipping waiver that makes it easier to move oil, fuel and fertiliser around the United States, Reuters reports citing the White House.

The decision adds roughly three months to the existing waiver that was set to expire on May 17, enabling foreign-flagged vessels to move commodities between US ports through mid-August.

White House spokeswoman Taylor Rogers confirms that Trump issued the extension.

“This waiver extension provides both certainty and stability for the US and global economies,” Rogers says.