President Donald Trump extended the Jones Act waiver for another 90 days on Friday, keeping foreign-flagged tankers eligible to move oil and other commodities between U.S. ports as the war with Iran continues to drive up fuel costs. The extension, confirmed by a White House official who spoke to Reuters, continues what is already the longest waiver in the shipping law's history. Foreign vessels will still need approval for individual voyages due to a restriction introduced in August after earlier blanket exemptions drew opposition from the domestic…