https://www.reuters.com/article/us-amazon-com-trump/trump-attacks-amazon-again-over-u-s-postal-rates-idUSKBN1H70MC >U.S. President Donald Trump launched his second attack in a week on Amazon.com Inc on Saturday, accusing the world's biggest online retailer of getting unfairly cheap rates from the U.S. Postal Service and not paying enough tax.