WASHINGTON (AP) -- U.S. automakers are concerned about President Donald Trump's agreement to tariff Japanese vehicles at 15%, saying they will face steeper import taxes on steel, aluminum and parts than their competitors.

"We need to review all the details of the agreement, but this is a deal that will charge lower tariffs on Japanese autos with no U.S. content," said Matt Blunt, president of the American Automotive Policy Council, which represents the Big 3 American automakers, General Motors, Ford and Jeep-maker Stellantis.

Blunt said in an interview the U.S. companies and workers "definitely are at a disadvantage" because they face a 50% tariff on steel and aluminum and a 25% tariff on parts and finished vehicles, with some exceptions for products covered under the United States-Mexico-Canada Agreement that went into effect in 2020.

The domestic automaker reaction reveals the challenge of enforcing policies across the world economy, showing that for all of Trump's promises there can be genuine tradeoffs from policy choices that risk serious blowback in politically important states such as Michigan and Wisconsin, where automaking is both a source of income and of identity.

Trump portrayed the trade framework as a major win after announcing it on Tuesday, saying it would add hundreds of thousands of jobs to the U.S. economy and open the Japanese economy in ways that could close a persistent trade imbalance. The agreement includes a 15% tariff that replaces the 25% import tax the Republican president had threatened to charge starting on Aug. 1. Japan would also put together $550 billion to invest in U.S. projects, the White House said.

The framework with Japan will remove regulations that prevent American vehicles from being sold in that country, the White House has said, adding that it would be possible for vehicles built in Detroit to be shipped directly to Japan and ready to be sold.

But Blunt said that foreign auto producers, including the U.S., Europe and South Korea, have just a 6% share in Japan, raising skepticism that simply having the open market that the Trump administration says will exist in that country will be sufficient.

"Tough nut to crack, and I'd be very surprised if we see any meaningful market penetration in Japan," Blunt said.

Asked at Wednesday's briefing about whether Trump's sectoral tariffs such as those on autos were now subject to possible change, White House press secretary Karoline Leavitt said that the issue had been going through the Commerce Department.

The framework with Japan was also an indication that some nations simply saw it as preferential to have a set tariff rate rather than be whipsawed by Trump's changes on import taxes since April. But for the moment, both Japan and the United Kingdom with its quotas on auto exports might enjoy a competitive edge in the U.S.

"With this agreement in place it provides Japan with a near-term operating cost advantage compared to other foreign automakers, and even some domestic U.S. product that uses a high degree of both foreign production and parts content," said Karl Brauer, executive analyst at iSeeCars. "It will be interesting to see if this is the first domino to fall in a series of foreign countries that decide long-term stability is more important that short term disputes over specific tariff rates."

Autos Drive America, an organization that represents major Japanese companies Toyota, Honda and Nissan and other international automakers, said in a statement that it is "encouraged" by the announced trade framework and noted its members have out-produced domestic automaker production for the past two years.

"International automakers have invested more than $124 billion in their U.S. operations over the past thirty years, and the certainty provided by this agreement allows them to plan for greater investment, bringing even more production to our shores and providing affordable options for American consumers," the statement said. "Now, we urge the Trump administration to swiftly reach similar agreements with other allies and partners, especially the European Union, South Korea, Canada and Mexico."

There is the possibility that the Japanese framework would give automakers and other countries grounds for pushing for changes in the Trump administration's tariffs regime. The president has previously said that flexibility in import tax negotiations is something he values. The USMCA is up for review next year.

Ford, GM and Stellantis do "have every right to be upset," said Sam Fiorani, vice president at consultancy AutoForecast Solutions. But "Honda, Toyota, and Nissan still import vehicles from Mexico and Canada, where the current levels of tariffs can be higher than those applied to Japanese imports. Most of the high-volume models from Japanese brands are already produced in North America."

Fiorani noted that among the few exceptions are the Toyota 4Runner, the Mazda CX-5 and the Subaru Forester, but most of the other imports fill niches that are too small to warrant production in the U.S.

"There will be negotiations between the U.S. and Canada and Mexico, and it will probably result in tariffs no higher than 15%," Fiorani added, "but nobody seems to be in a hurry to negotiate around the last Trump administration's free trade agreement."

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St. John contributed from Detroit.