U.S. President Donald Trump accused Amazon.com Inc. on Thursday of not paying enough tax, taking advantage of the U.S. postal system and putting small retailers out of business, but did not present any evidence to back up his criticisms or suggest any specific actions he planned to take.

Trump has attacked Amazon and its Chief Executive Jeff Bezos several times, and his latest comment on Twitter came a day after news website Axios reported that Trump was obsessed with the world's largest online retailer and wanted to rein in its growing power with federal antitrust laws.

"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!" Trump tweeted early on Thursday.