https://www.reuters.com/article/us-amazon-com-trump/amazon-shares-swing-as-trump-threatens-higher-shipping-rates-idUSKCN1HA1RR >Shares of Amazon.com Inc pared earlier gains on Tuesday after U.S. President Donald Trump repeated his unsubstantiated claim that deliveries for the world's biggest online retailer cost the U.S. Postal Service money and threatened to raise rates.