Ryosei Akazawa, Japan¡¯s chief tariff negotiator, is off to Washington again on Thursday as the United States promises clarity by the end of the week on Japan¡¯s $550 billion investment pledge.

It will be his 10th trip to the U.S. since tariff negotiations started in April, and the second time since the two countries reached a last-minute trade deal on July 22.

U.S. Commerce Secretary Howard Lutnick said on Tuesday in the United States that an agreement on the $550 billion pledge ¡ª which was made by Japan in the course of negotiations as a concession to get tariffs lowered ¡ª will be released later this week.

Officials in the U.S have described the pledge as involving ¡°all new capital¡± from Japan being invested in the U.S., with America in control and taking 90% of the profits. The United States has also said that tariff rates will be taken higher if the agreement is not implemented.

¡°You¡¯re going to see a national and economic security fund built with the Japanese money, the Korean money and other countries¡¯ money,¡± Lutnick said in a CNBC interview on Tuesday.

¡°They¡¯re going to give us money to build our infrastructure out in America,¡± he continued. ¡°Those are the deals that Donald Trump made using his tariffs ¡ª not using the money from the tariffs, but using the commitment of these countries that fundamentally understand a strong and powerful America is necessary for the world to be successful.¡±

Japanese officials have said that Japan will provide loans, loan guarantees and equity investment up to $550 billion ¡ª which is more than Japan¡¯s tax revenue last year ¡ª via government-backed financial institutions.

Akazawa has also said that direct equity investment will be just 1%-2% of that total.

Japanese officials have expressed concern that the tariff on automobiles has not yet been lowered ¡ª from the pre-agreement total of 27.5% to the agreed upon 15% ¡ª while the reciprocal rate has already been upped to 15% from the baseline rate of 10%.

They have also been preoccupied with the issue of whether the tariff deal with the United States should be in writing or not.

¡°My understanding is that between Japan and the U.S., it is the U.S. side that feels more strongly about creating such a document, or sees greater merit in doing so,¡± Akazawa said at a news conference on Tuesday.