President Donald Trump said the U.S. Postal Service should charge Amazon more to deliver packages, the latest in a series of public criticisms of the online retailer and its billionaire founder. From a report: "Why is the United States Post Office, which is losing many billions of dollars a year, while charging Amazon and others so little to deliver their packages, making Amazon richer and the Post Office dumber and poorer? Should be charging MUCH MORE!" Trump wrote on Twitter. The president's tweet drew fresh attention to the fragile finances of the postal service at a time when tens of millions of parcels have been shipped all over the country for the holiday season. The U.S. Postal Service, which runs at a big loss, is an independent agency within the federal government and does not receive tax dollars for operating expenses, according to its website. The U.S. president does not determine postal rates. They are set by the Postal Regulatory Commission, an independent government agency with commissioners selected by the president from both political parties. That panel raised prices on packages by almost 2 percent in November.