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The U.S. Supreme Court on Friday struck down much of President Donald Trump’s “reciprocal” tariffs, which were invoked based on the International Emergency Economic Powers Act.

But the White House leader didn’t take the decision lying down. Hours later, Trump announced on Truth Social that he’d be leveraging a new act, Section 122, to impose 10% tariffs globally — and one day later hiked them to 15%.

In response, the European Commission said Sunday that it would not accept any increase in tariffs. “A deal is a deal,” the EC said, according to Reuters. For its part, the U.S. would not alter the trade deals that it has struck with its partners, trade representative Jamieson Greer told CBS on Sunday.