President Trump on Thursday threatened world leaders with tariffs at the World Economic Forum in Davos, Switzerland, if they don't make their products in the U.S. David Wessel, senior fellow in economic studies at the Brookings Institution,

President Donald Trump reportedly elicited gasps from the international crowd gathered at the World Economic Forum in Davos, Switzerland, on Thursday when he suggested that Canada could become a U.S. state in order to avoid the sweeping tariffs he wants to impose.