With his well-tweeted animosity toward Amazon and Jeff Bezos as a backdrop, President Trump has twice pushed Postmaster General Megan Brennan to double the rate the U.S. Postal Service charges the ecommerce giant and other major shippers, the Washington Post has reported.

Brennan has thus far resisted the demands, the Post reported, noting how the rates are contractually set and any changes would have to be reviewed and approved by the Postal Regulatory Commission. If put into effect, the changes would cost the companies billions in additional delivery charges.

Trump continues to push against Brennan, the report stated, which led him last month to issue an executive order calling for a review of the USPS’s business, particularly rates it charges Amazon and other major shippers. Many observers saw personal animus toward Amazon in the…