WASHINGTON - Japan's trade minister on Monday said he asked the United States not to impose trade tariffs on his country, but did not win any assurance that Japan would be exempt, including from a 25 percent steel and aluminium duty set to start on Wednesday.

"We agreed to continue close consultations with the US government and to hold discussions at the working level as soon as possible," Yoji Muto said in Washington DC after meetings with Secretary of Commerce Howard Lutnick, US Trade Representative Jamieson Greer, and White House economic adviser Kevin Hassett.

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In a bid to persuade President Donald Trump to exempt Japan from tariffs on cars and other products, Muto and other senior Japanese officials are touting Japan as a close economic partner that has invested heavily in the US economy and created millions of jobs.

The new 25 percent tariff rates on steel and aluminium imports into the United States are set take effect on March 12, according to the executive orders signed by President Donald Trump last month.

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In talks with his US counterparts, Muto said they also discussed Japan buying more US liquefied natural gas (LNG), a gas pipeline project in Alaska, and Nippon Steel's bid to buy US Steel.