President Trump escalated his attack on Amazon on Thursday, saying that the e-commerce giant does not pay enough taxes, and strongly suggested that he may try to rein in the e-commerce business. From a report: The president took aim at Amazon's tax contributions, its use of the US Postal Service and practices that put "many thousands of retailers out of business!" The accusations aren't new. The tweet was likely prompted by an Axios story on Wednesday that claimed Trump was weighing "going after" Amazon over alleged antitrust activities or violations of competition laws. The Axios story appeared to contribute to a selloff of Amazon stock Wednesday, with Amazon shares dropping 4.4 percent, even though Trump's disdain for Amazon and its CEO, Jeff Bezos, was already well-known. Bezos owns The Washington Post, whose coverage has been less than glowing about the new president, which may be a factor in Trump's attacks. Trump's tweet, in full: I have stated my concerns with Amazon long before the Election. Unlike others, they pay little or no taxes to state & local governments, use our Postal System as their Delivery Boy (causing tremendous loss to the U.S.), and are putting many thousands of retailers out of business!