US Trade Representative Katherine Tai talks about how China's "nonmarket practices" are threatening the steel and aluminum sectors in the US. She speaks on "Bloomberg Surveillance." Follow Bloomberg for business news & analysis, up-to-the-minute market data, features, profiles and more: http://www.bloomberg.com/ Connect with us on... Twitter: https://twitter.com/business Facebook: https://www.facebook.com/bloombergbusiness/ Instagram: https://www.instagram.com/quicktake/?hl=en