Donald Trump reiterated his threat that trade talks with the EU must open up markets to farmers or he would impose tariffs on European car imports.

EU negotiating directives agreed Monday say agriculture must be excluded from planned negotiations.

“They barely take our agricultural products, and yet they can sell Mercedes Benz and they can sell anything they want in our country including their farm products, and it’s not fair,” the U.S. president said late Monday at an event in Minnesota.

Referring to the U.S.’s $169 billion trade deficit with the EU last year, Trump said the country has been treated “badly” by the EU “for so many years,” adding: “Those days are changing rapidly, they understand it.”

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He then threatened to impose tariffs on imports of autos and potentially also other products: “I talk to them and say ‘fellows, [that] has to change, has to change’ — and you know, I said ‘frankly, look if it doesn’t change, we’re gonna tariff all of your cars and everything else that comes in. You can’t treat our farmers that way, you can’t treat our people that way.”

EU trade chief Cecilia Malmström held out hope Monday that a transatlantic trade deal could be done “quite quickly” if both sides could agree on a basis to start negotiations, but such an agreement appears difficult to reach amid the row over agriculture.

Brussels has said it would immediately suspend trade talks should Trump impose auto tariffs.