WASHINGTON (AP) — President Donald Trump met Tuesday with executives from three big German automakers amid U.S.-European trade tensions focused on car exports and the threat of tariffs.

Executives from BMW, Daimler and Volkswagen were invited to participate in a series of meetings with Trump's top economic advisers to discuss investment opportunities in the United States, including in manufacturing and research and development, the White House said.

Trump, however, has threatened to slap tariffs on auto imports from Europe and other countries, citing U.S. trade deficits with those nations. Trump is relying on tariffs, and the threat of imposing them, to force other countries to buy more goods from America.

"I am a Tariff Man," the president said Tuesday in one of a series of tweets about a new round of trade talks with China after the world's two largest economies imposed tit-for-tat tariffs on hundreds of billions of dollars of each other's goods after Trump struck first.

"When people or countries come in to raid the great wealth of our Nation, I want them to pay for the privilege of doing so. It will always be the best way to max out our economic power. We are right now taking in $billions in Tariffs. MAKE AMERICA RICH AGAIN."

Trump had threatened to tax imported cars, trucks and auto parts, potentially targeting imports that last year totaled $335 billion, and the European Union had warned that it would retaliate with tariffs on products worth $20 billion if Trump put duties on cars and auto parts from Europe.

But Trump and European leaders stepped back from the brink of a trade war over autos during the summer, agreeing to open talks to tear down trade barriers between the United States and the EU.

Commerce Secretary Wilbur Ross, U.S. Trade Representative Robert Lighthizer, chief economic adviser Larry Kudlow and other administration officials were to participate in Tuesday's meetings.

The White House had no other comment on Trump's participation.

Kudlow, director of the National Economic Council, said administration officials want to talk to the German car makers "about a lot of things."

"I don't think this meeting or anything else for that matter, right now, is moving toward car tariffs," Kudlow told reporters Monday. "The president has said it's in his quiver of arrows, sure, but none of that's changed."

In Berlin on Monday, German Chancellor Angela Merkel also tried to tamp down speculation about tariffs, dismissing suggestions that the automakers could even conduct trade diplomacy. Merkel stressed that trade negotiations are the responsibility of the EU.

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