Donald Trump's threat of sweeping tariffs on imported products from Europe and elsewhere is set to do the most harm at home in the United States, says Luisa Santos, deputy director general of BusinessEurope, which groups together employer federations from 35 countries. The US president vowed Wednesday to hit the European Union with 25 percent tariffs -- the same level set to apply to imports from Canada and Mexico from next week, while China faces a 10 percent added tariff. "It's not good for business," Santos adds in Brussels. IMAGES AND SOUNDBITES