By Andrea Shalal, David Lawder and Jarrett Renshaw WASHINGTON (Reuters) -Donald Trump threatened on Wednesday to escalate a global trade war with further tariffs on European Union goods, as major U.S.

Canada and the European Union swiftly unveil retaliatory levies against the U.S., hours after Trump's sweeping tariffs on steel and aluminum.

European Commission President Ursula von der Leyen said as the United States is “applying tariffs worth 28 billion dollars, we are responding with countermeasures worth 26 billion euros,” or about $28 billion.