Julia Chatterley is live from the New York Stock Exchange. Here are the top business stories for today: Trade tariffs turn political - President Trump threatens Mexico with tariffs if they don't do more to tackle immigration, Beijing's blacklist -- U.S. firms brace for the release of China's own naughty list...and a billion dollar burn -- Uber's earnings show a lot of spending but a lot less worry about competition, shares rise pre-market. It's Friday...let's make a moveTo learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices