(Bloomberg) — US Ambassador to the EU Andrew Puzder said Washington will implement 25% tariffs on cars and trucks from the European Union “relatively soon” if the bloc doesn’t swiftly ratify a long-delayed trade deal.

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“Unless we see some substantial progress, I think you probably should expect those relatively soon,” Puzder told Bloomberg Television.

US President Donald Trump made the vehicle tariff threat last week, accusing the bloc taking too long to ratify the agreement, which was initially reached last July. The EU, meanwhile, is frustrated over several Trump moves it argues undermine Washington’s commitments under the pact.

Puzder’s comments add pressure to EU negotiators this week as they try to finalize proposed amendments to the deal.

“What the president was saying was, ‘Look, this has gone on long enough,’” Puzder said. “You’ve done nothing for nine months.”

The potential car tariffs have brought long-standing transatlantic trade tensions to a head.

Under the original deal, the EU agreed to erase levies on US industrial goods in exchange for a 15% tariff ceiling on most European products, including vehicles. A 25% car tariff would therefore violate that ceiling.

The EU has warned it is ready to retaliate, but would prefer to deescalate and preserve the existing pact — which the US has partially implemented, but the bloc has not. On Tuesday, EU trade chief Maros Sefcovic told US Trade Representative Jamieson Greer that the bloc wants the main parts of the agreement in place by July. Sefcovic also pushed Washington to respect previous trade commitments.

“I don’t know that July would be fast,” Puzder said. “I think the president’s saying he’s pushing for something more rapid, something quicker.”

Puzder’s colleague, US Trade Representative Jamieson Greer, echoed the message later on Wednesday.

“I’m not setting a hard date on it,” he told Bloomberg Television. “My view is it’s already past due.”

Europe is also smarting over Washington’s decision to widen a 50% metals tariff to hundreds of products that include steel and aluminum, like motorcycles and tableware. The move didn’t explicitly violate any US commitments, but many Europeans felt it nonetheless hollowed out the tariff ceiling.

Recently, the US attempted to address Europe’s frustration, changing how the tariff was calculated and exempting some products. But it did little to help, with officials saying the tweak actually made the situation worse for roughly half of the affected products.

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