Items that have been proposed for inclusion are industrial and agricultural. They are meant to target products — including soybeans, beef and chicken — that are important exports from Republican strongholds. Those include the Louisiana district that elected Mike Johnson, the House speaker.

The goal is to have the new measures in force by mid-April.

The announcement was Europe’s opening move in an unfolding trade conflict — one that is widely expected to intensify over the month ahead.

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