Donald Trump’s proposed 30% tariff on European Union goods is “effectively prohibitive” to transatlantic trade and could warrant retaliation, the bloc’s chief negotiator said.Briefing reporters in Brussels on Monday before a gathering of trade ministers,

Trade between the EU and the U.S. would become “almost impossible” if Donald Trump followed through on his threat to impose 30% tariffs, the EU’s trade commissioner warned on Monday. “If you’re talking about 30% or 30% plus,