Which is weird. Because in a 1990 lawsuit - regarding his alleged use of undocumented workers from Poland to build Trump Tower - The Donald testified under oath that "I believe on occasion I used that name".
Trump was referring specifically to the nom de plume "John Barron" in that instance but it's been widely reported that he used Barron and "John Miller" interchangeably at the time.
The Post managed to reach Trump after the story posted and, after spending 45 minutes on the phone with him, asked if he was "John Miller." Here's what happened next:
"The phone went silent, then dead. When the reporters called back and reached Trump's secretary, she said, 'I heard you got disconnected. He can't take the call now. I don't know what happened.'"
Quick reminder: Donald Trump is the presumptive Republican nominee for president.
The "John Miller" thing isn't likely to badly damage Trump among his voters - most of whom couldn't, frankly, care less. Trump has said and done far more controversial things than pretend to be his own spokesperson without his supporters even batting an eye.
But, part of what Trump needs to do is reassure the party regulars that he is the sort of guy who can be trusted as the GOP standard-bearer in November. Trump spent Friday in Washington doing just that - meeting Speaker Paul Ryan and other party leaders. Those meetings, by all accounts, went well.
Less than 24 hours later, however, the "John Miller" story dropped - re-stoking every doubt wavering Republican leaders had about Trump's trustworthiness.
John Miller, for even existing, means Donald Trump had the worst week in Washington. Congrats, or something.