The head of one of the world's biggest hedge funds has condemned President Trump's "nonsensical" trade war and the damage it has wreaked to the United States' brand. Ken Griffin, the billionaire chief executive of Citadel, said: "The United States was more than just a nation. It's a brand. It's a universal brand, whether it's our culture, our financial strength, our military strength. "America rose beyond just being a country. It was like an aspiration for most of the world and we're eroding that brand right now." So the president and the secretary of Treasury and the secretary of commerce need to be very thoughtful that when you have a brand, you need to behave in a way that respects that brand, that strengthens that brand. Because when you tarnish that brand, it can be a lifetime to repair the damage that has been done."