President Trump has been urging the postmaster general to double the U.S. Postal Service rates for Amazon, the Washington Post — which is owned by Amazon founder Jeff Bezos — reported Friday. Some administration officials told the Post that many Trump attacks on Amazon — which include accusing the Washington Post of being its “chief lobbyist” — are driven by articles in the newspaper he didn’t like.

U.S. Postmaster General Megan Brennan has tried to explain to Trump that the contracts that establish postal rates go through a regulatory commission, according to the Washington Post, and that the U.S. Postal Service has benefited from its relationship with the online retailer.

In addition to his lobbying of Brennan, Trump has held discussions about Amazon’s business practices with other senior advisors, including Treasury Secretary Steven Mnuchin, then-National Economic Council Director Gary Cohn and Domestic Policy Council Director Andrew Bremberg, the Washington Post reported.

Trump’s advisors have disagreed on whether Amazon is paying the U.S. Postal Service enough, with Cohn — who left the White House in March — serving as one Amazon’s biggest defenders, according to the WaPo report.

A review of the U.S. Postal service is underway, and is being led by Mnuchin counselor Craig Phillips and Kathy Kraninger, an Office of Management and Budget official, the Washington Post reported.

Trump has not kept his disdain for Amazon or Bezos private. When bashing stories in the Washington Post about his administration on Twitter, Trump often labels the newspaper the “Amazon Washington Post.” He’s accused Bezos of using the Washington Post to “to screw public on low taxation” of Amazon.

The #AmazonWashingtonPost, sometimes referred to as the guardian of Amazon not paying internet taxes (which they should) is FAKE NEWS! — Donald J. Trump (@realDonaldTrump) June 28, 2017

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. The Failing N.Y. Times reports that “the size of the company’s lobbying staff has ballooned,” and that… — Donald J. Trump (@realDonaldTrump) March 31, 2018

…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! — Donald J. Trump (@realDonaldTrump) March 31, 2018