President Donald Trump's shifting trade policy is causing headaches for America's largest retailer. While Walmart CFO John David Rainey welcomed the recent reduction in tariffs, he said the company is not out of the woods yet."Let me emphasize, we still think that's too high," he said of the latest rates during Walmart's earnings call on Thursday. Walmart says it imports about one-third of what it sells in the US from other countries, namely China, Mexico, Canada, Vietnam, and India, and that cargos are ...