Ivanka Trump posted the picture Tuesday night -- showing her smiling while holding a can of Goya's black beans -- on Twitter and Facebook alongside the company's slogan, "If it's Goya, it has to be good," in English and Spanish.
U.S. regulations prohibit federal employees from using their public office "for the endorsement of any product, service or enterprise."
Trump shared the image amid calls to boycott the New Jersey-based food company Goya, known for its foods particularly popular in Latino households, after its chief executive visited the White House last week.
President Trump on Wednesday morning tweeted implicit backing of his daughter's posts, writing that Goya was "doing GREAT" and that "the Radical Left smear machine backfired, people are buying like crazy!"
He later posted a photo of himself on his official Instagram account, smiling as he sat at the Resolute Desk in the Oval Office, with five different Goya products in front of him, giving a double thumbs-up.
Ethics experts said that Ivanka Trump's promotion of a Goya product on her personal social media accounts, on which she identifies herself as an adviser to the president and which she regularly uses to promote the administration, clearly broke the rules, specifically Title 5, Section 2635.702, of the U.S. Code of Federal Regulations.
"There's a particularly unseemly aspect to this violation: it creates the appearance that the government's endorsement is for sale," Shaub said. "Endorse the president and the administration will endorse your product."
A spokeswoman for the White House said in a statement that Trump had been expressing her "personal support" for Goya.
“Only the media and the cancel culture movement" -- a reference to online calls online to boycott certain figures -- "would criticize Ivanka for showing her personal support for a company that has been unfairly mocked, boycotted and ridiculed for supporting this administration -- one that has consistently fought for and delivered for the Hispanic community," the spokeswoman, Carolina Hurley, said. "Ivanka is proud of this strong, Hispanic-owned business with deep roots in the U.S. and has every right to express her personal support."
Norm Eisen, who from 2009 to 2011 served under President Barack Obama as a White House special counsel and a special assistant for ethics and government reform, noted that even though Trump posted on her personal social media accounts, those accounts still listed her as an "Advisor to POTUS" and the posts would still qualify as "a serious ethics violation."
Eisen, who more recently served as a special counsel to the House Judiciary Committee during President Trump's impeachment and Senate trial, told ABC News "this would’ve been treated as a serious matter in any other administration."
"In the Trump administration, she will probably be rewarded," Eisen said. "That bespeaks an ethical degradation for which the voters are about to punish the president severely."