The White House has defended its role in helping to broker a deal that will shroud art deals by President Joe Biden's son in secrecy, APA reports citing BBC.
Paintings by Hunter Biden are expected to fetch up to $500,000 (£360,000) apiece at auction this autumn.
The president's spokeswoman said "reasonable safeguards" had been applied to the upcoming sale.
But a former White House ethics chief said the arrangement was "very disappointing".
The younger Biden's business dealings in Ukraine, China and elsewhere have often been held up by Republican critics as a conflict of interest for his father, which both Bidens deny.
Hunter is currently facing a federal tax investigation, though he has said he is "100% certain" he will be cleared.