TL;DR
Trump’s statement, made on social media, came amidst ongoing bilateral tariff negotiations. Under a "minimum access" agreement with the World Trade Organization, Japan imports 770,000 tons of rice tariff-free each year, with the United States the No. 1 exporter, followed by Thailand. Up to 100,000 tons of the amount is imported for human consumption. Any rice imported to Japan beyond the special quota is subject to a tariff of 341 yen (about $2.40) per kilogram.
by SkyInJapan