The European Union is said to be ready to pause the approval of its trade pact with the United States while it awaits details on the Trump Administration’s latest tariff proposals.

Zeljana Zovko, the chief trade negotiator for the European People’s Party group, stated that delaying the ratification is the only available option until more clarity is obtained.

TIME has contacted Zovko for verification and additional remarks.

These European accounts follow President Donald Trump’s weekend pledge to enact a 15% worldwide tariff, a reaction to the U.S. Supreme Court’s Friday decision that his broad tariffs were unlawful. The Court found that Trump could not use the 1977 International Emergency Economic Powers Act (IEEPA) to justify such measures.

Trump announced the planned increase, stating, “Over the coming few months, the Trump Administration will establish and implement the new, legally allowable tariffs.”

The President increased the proposed rate from an initial 10% announced right after Friday’s ruling. He cited powers under the Trade Act of 1974 when proposing the duties.

Trump’s announcement of a fresh tariff scheme has cast doubt on the basis of the agreement finalized in July 2025. That deal suggested a 15% import duty on most European goods coming into the U.S., the removal of tariffs on American industrial exports to Europe, and a plan for the E.U. to buy $750 billion worth of U.S. energy.

Zovko expressed worries on Sunday morning, noting: “Given the lack of complete legal certainty around the newly-announced tariffs, especially after the Supreme Court ruling, we cannot make any hasty decisions.”

“It would be reckless to act without a thorough evaluation of the circumstances, its legal consequences, and its economic effects,” she continued. “We will keep a close watch on events and stay dedicated to our unchanged goal from the start: reestablishing stability and predictability in our trade ties.”

This instability led top E.U. officials to schedule an urgent meeting for Monday to review the transatlantic agreement.

Bernd Lange, who leads the European Parliament’s trade committee, described the scenario as “sheer customs chaos from the U.S. government” and called for a session to halt the deal’s legislative endorsement pending “thorough legal evaluations and unambiguous assurances from the United States.”

“Wouldn’t new tariffs under Section 122 constitute a violation of the agreement?” he asked. “In any case, nobody knows if the U.S. will comply—or even if it can.”

A representative from Lange’s office informed TIME that more information would be provided following Monday’s meeting.

The European Commission, which manages trade policy for the 27-nation bloc, is also demanding “complete clarity” from Washington on its forthcoming tariff actions.

“The present circumstances do not support achieving ‘fair, balanced, and mutually beneficial’ transatlantic trade and investment, as both parties agreed and outlined in the E.U.-U.S. Joint Statement from August 2025,” the statement noted.

The E.U.’s executive body made clear it will not agree to higher U.S. tariffs, pointing to the existing, hard-won pact.

“An agreement is an agreement. As the biggest trading partner of the United States, the E.U. anticipates the U.S. will respect the obligations outlined in the Joint Statement—just as the E.U. upholds its own,” the Commission cautioned. “Specifically, E.U. goods must keep receiving the most favorable terms, with no tariff hikes above the explicit, comprehensive limit already established.”

TIME has contacted the White House for a statement.

The Commission verified that E.U. Trade Commissioner Maroš Šefčovič communicated with U.S. Trade Representative Jamieson Greer and U.S. Commerce Secretary Howard Lutnick during the weekend.

Questioned on Sunday morning about whether deals with the E.U. would stay in place, Greer responded that they “intend to uphold them.”

“I have not had anyone tell me the agreement is canceled. They wish to observe how this unfolds. I am actively discussing it with them,” he said.

The E.U.-U.S. pact had already been doubted in January following a threat from Trump, which he later retracted.