May 18, 2018 4:45 PM, EDT

Trump Wanted to Double Amazon Postal Rates, Washington Post Says

Jim Young/Bloomberg News

President Donald Trump pushed U.S. Postal Service officials to double package delivery rates paid by Inc. and other companies, the Washington Post reported, highlighting that his beef with the e-commerce giant and founder Jeff Bezos goes beyond tweets.

Trump pressured U.S. Postmaster General Megan Brennan to raise Amazon’s rates, which Brennan resisted by explaining that the agency was bound by contract and any changes would have to be approved by a regulatory commission, the newspaper said, citing unidentified people familiar with their conversations.

RELATED: How Amazon is helping the US Postal Service, despite what Trump thinks

Amazon shares slipped 0.3% to $1,576.65 in afternoon trading in New York. That’s about where they were before the report. The White House declined to comment, and the Postal Service didn’t immediately respond to a request for comment May 18.

Trump recently ordered a review of the Postal Service’s finances and suggested on Twitter that it might start charging Amazon higher delivery rates. Bezos owns The Washington Post, which has drawn criticism from the president over its coverage of his administration.

Trump has repeatedly lambasted Amazon from his Twitter pulpit, including a March 29 broadside: “I have stated my concerns with Amazon long before the Election. Unlike others, they pay little or no taxes to state & local governments, use our Postal System as their Delivery Boy (causing tremendous loss to the U.S.), and are putting many thousands of retailers out of business!”

While the U.S. Postal Service’s contract with Seattle-based Amazon is confidential, the agency has argued that the relationship is beneficial and supports mail customers and other services. The Postal Service is prohibited from charging shippers less than its delivery costs.

RELATED: Amazon nears stock record as Wall Street praises Prime milestone

Amazon relies on the Postal Service for the so-called last mile (delivery from warehouses to customers’ homes) on as many as 40% of all U.S. orders, according to analysts’ estimates. While the relationship is mutually beneficial, it saves Amazon as much as $2.6 billion a year versus rates charged by independent couriers such as UPS Inc. and FedEx Corp., analysts say.

UPS ranks No. 1 on the Transport Topics Top 100 list of the largest North American for-hire carriers, and FedEx is No. 2

Amazon is experimenting with its own delivery operations, including using independent contractors in their own vehicles — similar to ride-hailing services from Uber Technologies Inc.