Now Chicago's Art Institute is speaking up to say that Pierre-Auguste Renoir's "Two Sisters" hangs in the museum - and not in the president's home in Trump Tower.
Ms Hicks said the institute was "satisfied that our version is real".
The painting was gifted to the institute in 1933, spokeswoman Amanda Hicks told the Chicago Tribune.
Renoir sold the painting to an art dealer in 1881.
A USA museum says an Impressionist painting which President Donald Trump reportedly claims to own is a fake.
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This clear lie comes to light in a recent episode of Vanity Fair's "Inside the Hive" podcast, in which Trump biographer Tim O'Brien shares an anecdote from a few years ago, in a brighter, pre-Trump era.
"Donald, it's not", he recalled telling Trump.
Years later, after Trump won the presidency, the painting turned up in a 60 Minutes interview conducted in Trump Tower. When questioned about its authenticity, Trump insisted it was legitimate, O'Brien told Vanity Fair this month.
At least someone's impressed: "President Trump on Thursday said the federal response to hurricane-ravaged Puerto Rico deserves a grade of 10 out of 10 as he met at the White House with Ricardo Rosselló, the governor of the USA territory".
She bought it for £700,000 from Paul Durand-Ruel, who got the piece from the master painter in 1881.
"I'm sure he's still telling people who come into the apartment, 'It's an original, it's an original, '" O'Brien said on the podcast. Along with giving to charity, drawing large crowds, and having a lot of great plans, Trump has reportedly also bragged about owning the original "Two Sisters (On the Terrace)". Based on a photo taken there that shows the painting, "it seems clearly to be a copy of that famous Chicago picture", an art historian adds, per ArtNet, which cites a second art historian who agrees that Renoir never painted exact replicas of his own work.