President Donald Trump put European leaders on notice, threatening punitive action against transatlantic allies if they aren’t willing to compromise on a trade deal before the U.S. elections.

Speaking at the World Economic Forum in Davos, Switzerland, Trump departed from the more conciliatory tone he struck on Tuesday, renewing claims that the European Union is unfair to the U.S. and saying that he targeted China first in his trade war because the EU is harder to deal with.

The EU and the U.S. agreed in July 2018 to work toward a free-trade agreement, but progress stalled after the Trump administration refused to begin negotiations until they included agriculture in the discussions. Trump has threatened to impose tariffs on European auto exports and has already hit $7.5 billion of EU exports with levies over an airline dispute.

“They have trade barriers where you can’t trade, they have tariffs all over the place, they make it impossible,” Trump said in Davos on Wednesday. “They are frankly more difficult to do business with than China.”

U.S. Treasury Secretary Steven Mnuchin also dangled the prospect of retaliatory tariffs on automobile imports if France doesn’t withdraw a disputed tax on technology companies.

“If people want to just arbitrarily put taxes on our digital companies, we will consider arbitrarily putting taxes on car companies,” Mnuchin said at a panel discussion in Davos on Wednesday. “We think the digital tax is discriminatory in nature.”

This article was provided by Bloomberg News.