Detroit’s “Big Three” automakers will reveal second-quarter financial results Wednesday amid uncertainty over President Donald Trump’s proposal to place tariffs on imported cars.

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The auto industry is pushing back against a plan to impose levies on a reported $351 billion in vehicles and parts shipped from markets overseas. In June, Trump threatened to slap the European Union with a 20% tax on car imports unless the bloc reduces trade restrictions. German automakers have reportedly thrown their support behind setting tariffs to 0%, and a group of industry trade organizations sent an open letter to Trump last week calling tariffs a “massive tax on consumers.”

“A strong economy gave auto sales a solid boost in the first half of the year, but in many ways the industry is operating on borrowed time,” Jeremy Acevedo, manager of industry analysis at Edmunds, said in an email.

Higher interest rates and vehicle prices have made car purchases more expensive, and tariffs could cause a “dramatic snap back,” Acevedo added.

“If tariffs cause a significant economic slowdown in tandem with spiking vehicle prices, the impact on the auto sector could be devastating,” he said.

While executives will likely face questions during earnings calls over the impact of trade policy, automakers mostly have enjoyed stronger U.S. sales than expected, thanks to consumer demand for SUVs and trucks.

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