President Donald Trump repeated an earlier call for an internet tax, in a thinly veiled shot at Amazon's Jeff Bezos, who owns The Washington Post.

"The internet — they're going to have to start paying sales tax because it's very unfair what's happening to our retailers all over the country that are put out of business," Trump said Wednesday.

Trump also reiterated concerns about Amazon's effect on the U.S. Postal Service as it struggles to keep up with online orders.

The comments mirror tweets from the president in December that named the e-commerce giant.

Dec tweet

"There's always been a fear for players like an Amazon or a Google that something like this could actually get through," Daniel Ives, head of technology research at GBH Insights, told CNBC. "We believe it's more noise than a real threat."