The European Union’s top envoy to the U.S. on Tuesday told a Chicago audience the multinational bloc is anticipating a difficult time working with the Trump administration on international trade and climate change.Still, EU Ambassador David O’Sullivan exuded confidence to an audience of approximately 60 diplomats, business professionals and others at the Chicago Council on Global Affairs that the two governments can work together.The talk was given at Two Prudential Plaza.“We are perplexed, as many, over …