Mr. Sefcovic, who is in charge of negotiating trade matters for the E.U., talked to his American counterparts by phone last week. He said on Thursday that he had learned that the Trump administration did not want to negotiate on trade until after April 2, when the United States is expected to announce a new and even more sweeping round of tariffs on its global trading partners.

“For them, this should serve as a base line for redefining and rebuilding U.S. trading relations with the rest of the world,” Mr. Sefcovic said. “Only then may partners be able to engage on possible negotiations.”

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