President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has reportedly urged the U.S. postmaster general to double shipping rates for Amazon.com and other companies amid months of his continued criticism that the online retailer is costing the Postal Service "billions" of dollars in revenue.

Trump has personally met with Postmaster General Megan Brennan multiple times since 2017 to petition her for a hike on rates for Amazon and other firms that ship packages, The Washington Post reported Friday, citing officials familiar with the conversations.

The president's demands came despite counsel from close advisers and top Postal Service employees that Amazon, the largest shipper of packages through USPS, actually helps keep it afloat financially.

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According to the Post, Brennan explained to Trump in their conversations that the Postal Service is bound by its contracts with retail companies, noting that to change them would require a review by the independent regulatory agency that oversees the USPS.

Trump signed an executive order last month to create a task force to look into the Postal Service's "unsustainable financial path."

USPS has given Amazon a shipping discount due to the volume of packages it ships, but has not released details on its agreement with the retailer. Analysts have estimated that the company uses the Postal Service for about 40 percent of its shipping.

Trump also reportedly met with different groups of senior advisers including Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Powell, Mnuchin stress limits of emergency loans | House seeks to salvage vote on spending bill | Economists tell lawmakers: Kill the virus to heal the economy Economists spanning spectrum say recovery depends on containing virus Powell, Mnuchin stress limits of current emergency lending programs MORE and former National Economic Council Director Gary Cohn Gary David CohnGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Former national economic council director: I agree with 50 percent of House Democrats' HEROES Act MORE on the service's financial dealings and whether Amazon was in fact costing the USPS "massive amounts of money," as he once claimed in a tweet.

The president has frequently taken aim at The Washington Post, which Amazon owner Jeff Bezos purchased in 2013.