Yuri Gripas | Reuters
President Donald Trump arrives on December 2, 2017 in Andrews, Maryland, on his return from New York.
President Donald Trump struck Amazon for the sixth time in a week A trip by the Air Force One on Thursday from an event in West Virginia
He then switched gears, mentioning how "the post with Amazon is not doing well."
He noted that the Supreme Court will decide later this year whether all of Amazon Transactions are subject to state sales tax.
"We'll see what happens," said the president.
Trump has been an extremely vocal critic of Amazon for the past few weeks, claiming that the company is using its deal with the US Postal Service to violate brick-and-mortar retail.
Some observers have represented the partnership between USPS and Amazon was positive for the delivery service.
Amazon shares shrank in extended trading.