On Sunday, U.S. President Donald Trump has threatened to confront the European Union over what he calls “very unfair” trade policy toward the United States. Trump has demanded tougher enforcement of trade rules and last week signed into law 30 percent tariffs on imported solar panels, among the first unilateral trade restrictions. In an interview, Trump said “I’ve had a lot of problems with European Union, and it may morph into something very big from that standpoint, from a trade standpoint."