TOKYO (AP) — Japan’s top trade negotiator abruptly canceled a trip to Washington aimed at issuing a joint statement on a tariffs deal with the Trump administration, as a top government spokesman urged the U.S. side to speed up implementation of the agreement.

Trade envoy Ryosei Akazawa was scheduled to leave Tokyo for Washington on Thursday for a 10th round of talks, following up on the agreement announced on July 22.

But Chief Cabinet Secretary Yoshimasa Hayashi told reporters some details required further consultations, so the trip was postponed.

In July, the two sides agreed on a 15% tax on imports of most Japanese goods, effective Aug. 1, down from an earlier 25% rate announced by President Donald Trump as so-called “reciprocal tariffs” on the major U.S. ally. Japanese officials discovered days later that the preliminary deal would add a 15% tariff to other tariffs and objected. Officials in Washington have acknowledged the mistake and agreed to abide by the agreement on a 15% tariff, and to refund any excess import duties that were paid.

So far, that hasn’t happened.

“We will strongly request the United States to amend its presidential order to correct the reciprocal tariffs and to issue the presidential order to lower tariffs on autos and auto parts,” Hayashi said.