(Reuters) – President Donald Trump called on the U.S. Postal Service on Friday to charge “much more” to ship packages for Amazon, picking another fight with an online retail giant he has criticized in the past.

“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 just 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.

Package delivery has become an increasingly important part of its business as the Internet has led to a sharp decline in the amount of first-class letters.

The 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…

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