The U.S. government on Thursday promised to amend a presidential executive order to remove overlapping tariffs on Japanese goods, Tokyo's trade negotiator said, after talks in Washington to fix what he called a "regrettable" error.

Trade negotiator Ryosei Akazawa calls to ensure that a 15% levy on Japanese imports is not stacked on goods, such as beef.

Japan has been seeking clarification, as a lack of written confirmation of the deal it struck with the U.S. last month has led to confusion over whether President Donald Trump's tariffs that took effect on Thursday will be stacked on top of existing levies.