Uproar and revived criticisms of standing “conflict of interest” concerns surfaced Saturday after it was revealed that a business trip that President Donald Trump’s second-eldest son, Eric Trump, recently made to Uruguay cost U.S. taxpayers nearly a hundred thousand dollars in hotel costs and administrative fees.

As the Washington Post, which broke the story, reported:

What’s not out of the ordinary is that close family members of the president are provided with Secret Service protection—that is an established tradition and protocol. But what has sparked the serious concern is how taxpayers are being forced to subsidize the business expenditures by the president’s wealthy family members—especially Eric and his brother Donald Trump Jr.—who have been temporarily put in charge of the Trump Organization while their father serves as president.

“There is a public benefit to providing Secret Service protection,” Kathleen Clark, an expert on government ethics and law professor at Washington University in St. Louis, told the Post. “But what was the public benefit from State Department personnel participating in this private business trip to the coastal town? It raises the specter of the use of public resources for private gain.” Clark said the whole affair “is an example of the blurring of the line between the personal interest in the family business”—from which Trump has refused to fully divest, and the U.S. government he is now running.