Donald Trump is going after Amazon, again.

In a series of tweets, Trump wrote that Amazon's package deal with the U.S. Post Office is a bad deal for taxpayers. But federal regulators say otherwise.

"While we are on the subject, it is reported that the U.S. Post Office will lose $1.50 on average for each package it delivers for Amazon. That amounts to Billions of Dollars," read his series of tweets. "The Failing N.Y. Times reports that 'the size of the company’s lobbying staff has ballooned' and that...does not include the Fake Washington Post, which is used as a “lobbyist” and should so REGISTER. If the P.O. 'increased its parcel rates, Amazon’s shipping costs would rise by $2.6 Billion.' This Post Office scam must stop. Amazon must pay real costs (and taxes) now!"

However, The Associated Press reports that federal regulars reviewed the deal (as it does every year) and found it to be "profitable" for the USPS. While envelope mailing has gone down, companies like Amazon have helped package deliveries to be on the rise for the company. But even if it weren't—the U.S. Post Office isn't funded by taxpayer money. As the USPS' site reads, "The Postal Service receives NO tax dollars for operating expenses and relies on the sale of postage, products and services to fund its operations."

This leads many to believe that Trump isn't actually concerned with Amazon's packaging deals—but rather Amazon's CEO, Jeff Bezos, also owns The Washington Post, one of the news sources that's been consistently critical of him.