In 2006, Trump sued O'Brien, author of "TrumpNation: The Art of Being the Donald", for writing in his book that Trump's net worth was $150 million to $250 million.
Donald Trump has always maintained that the Pierre-Auguste Renoir "Two Sisters" painting in his NY apartment is the original but on Thursday, Art Institute of Chicago disagreed and insisted that the real "Two Sisters on the Terrace" by Renoir is hanging on its walls and not Trump's.
When Trump assured O'Brien that the painting was real, the biographer was skeptical.
In an interview with Vanity Fair's "Inside the Hive" podcast earlier this week, O'Brien - a Chicago native - recounted talking to Trump years ago while on the businessman's private jet.
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The Renoir painting has popped up in the background of Trump's apartment in two interviews: With "60 Minutes" when Trump was still president-elect; and during a Fox News interview with first lady Melania Trump.
"Donald, it's not", he said, according to Vanity Fair.
However, art experts from Art Institute of Chicago have insisted he is wrong, because the actual work is in their gallery.
"He believes his own lies in a way that lasts for decades", O'Brien explained.
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Pierre explained, "We thought about it but decided, 'No, that's a bad idea.' At one point, you have to calm down". Pierre told the Washington Post that he still adores the inaugural gown, saying "I really love the dress".
Art Institute spokeswoman Amanda Hicks said the institute is "satisfied that our version is real".
Trump's supporters are enthralled by their plastic Messiah, and they may accept his alternate truth, but it's incumbent upon the press to point out that the emperor is buck naked. "He'll tell the same stories time and time again, regardless of whether or not facts are right in front of his face", O'Brien added. Trump's version apparently now hangs in Trump Tower. "From my trained eye looking at a pretty good photograph of Mrs. Trump in their penthouse at Trump Tower, it seems clearly to be a copy of that famous Chicago picture".
The White House didn't respond to questions about Trump's Renoir, the Tribune reported.
The Renoir was gifted to the institute in 1933 by Annie Swan Coburn, who bought it from Paul Durand Ruel for $100,000.
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Who is? Besides the Art Institute and O'Brien, Twitter has plenty to say.