"I have stated my concerns with Amazon long before the Election", Trump wrote in a single tweet with liberal capitalization.
Amazon fought for years against collecting sales tax but now collects taxes nationwide.
Read Friday's Arkansas Democrat-Gazette for full details. He called the tech giant a "no-tax monopoly" previous year, adding that it was doing great damage to other retailers.
"Without packages, the U.S. Postal Service would have to raise prices on all other mail services", the source said.
"The president has expressed his concerns with Amazon", White House spokeswoman Lindsay Walters told reporter on Air Force One en route to OH, where Trump was delivering a speech.
Since that report Wednesday morning, shares of Amazon have shed almost 9%-lopping off as much as $10.7 billion from the net worth of Bezos, who recently became the world's richest man (excluding, perhaps, Russian President Vladimir Putin).
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But judging from Trump's past tweets, there is a significant amount of evidence to suggest that the president is, in fact, "obsessed" with Amazon. Amazon's stock, which is up more than 65 percent in the last 12 months, rose 1 percent to close at $1,447.34 Thursday. "And that puts brick-and-mortar retail stores at a disadvantage", Shah said. USPS declined to comment on Trump's tweet.
Because Amazon ships so many packages though the post office, it pays a lower rate than most customers.
Amazon has carved out an influential position in Washington through lobbying, campaign contributions and pushing policy issues like job creation, but it could still face problems if Trump takes action against it.
"Walmart was crushing the little guys before Amazon, and more of Amazon's growth is coming from the Walmarts of the world", Kerner said.
It's not clear what the president hopes to get out of his offensive against Amazon, but Amazon is run at the behest of Jeff Bezos, who also owns The Washington Post, a favorite media target for the president.
Like other major publications, Trump has said the Washington Post publishes "fake news" in order to hurt his presidency.