President Trump’s argument that the U.S. Postal Service should charge higher prices to deliver Amazon products would actually cost the independent agency business, according to a new report released on Monday.

The president has repeatedly expressed frustration with the Postal Service amid a grudge against Jeff Bezos, Amazon’s chief executive officer and owner of the Washington Post — a perennial target in the president’s crusade against often unflattering news his administration says is false. Instead, it’s Trump’s claim that the postal service loses money on each package it ships from Amazon that is mistaken, according to a report from the Information Technology and Innovation Foundation.