What we're hearing: Trump has talked about changing Amazon's tax treatment because he's worried about mom-and-pop retailers being put out of business.

A source who's spoken to POTUS: "He's wondered aloud if there may be any way to go after Amazon with antitrust or competition law."

Trump's deep-seated antipathy toward Amazon surfaces when discussing tax policy and antitrust cases. The president would love to clip CEO Jeff Bezos' wings. But he doesn't have a plan to make that happen.

Behind the president's thinking: Trump's wealthy friends tell him Amazon is destroying their businesses. His real estate buddies tell him — and he agrees — that Amazon is killing shopping malls and brick-and-mortar retailers.

Trump tells people Amazon has gotten a free ride from taxpayers and cushy treatment from the U.S. Postal Service.

"The whole post office thing, that's very much a perception he has," another source said. "It's been explained to him in multiple meetings that his perception is inaccurate and that the post office actually makes a ton of money from Amazon."