President Donald Trump is threatening to impose higher tariffs on Japanese exports to the United States over what he claims is the country’s unwillingness to buy American-grown rice.

“They won’t take our RICE, and yet they have a massive rice shortage. In other words, we’ll just be sending them a letter, and we love having them as a Trading Partner for many years to come,” Trump said in a post on Truth Social.

Trump’s claim that Japan “won’t take” rice from the US isn’t true. The country bought $298 million worth of rice from the US last year, according to US Census Bureau trade data. Between January and April of this year, Japan bought $114 million worth of rice.

However, it’s unclear if Japanese officials involved in ongoing trade negotiations between the two countries have said they will stop buying rice from the US in the future. On Tuesday, Chief Cabinet Secretary Yoshimasa Hayashi said that trade talks between the two sides are ongoing, and that the Japanese government is aware of Trump’s claim, though he declined to comment on it.

“While we refrain from disclosing the specifics of our discussions with the US, Japan will continue to vigorously pursue sincere and honest discussions with the aim of achieving an agreement that will benefit both Japan and the US,” he said.