Donald Trump has threatened to slap a 50% tariff on all imports from the European Union starting June 1. He clearly thinks this move will force Brussels into making major trade concessions, even as investors warn it could wipe out the modest global stock market recovery.

By Hongmei Li, Pratima Desai, Lewis Jackson HONG KONG/LONDON (Reuters) -Unusually large shipments of copper to the United States are unlikely to abate as long as the threat of tariffs hangs over the market and price premiums for the metal on U.