The site was chosen despite ongoing investigations into whether Trump has used his office for personal gain. Mulvaney said Thursday that he was unconcerned by the appearance of a conflict of interest. He told reporters Doral was chosen partially because the site was dramatically cheaper than others officials considered.
"There's no issue here on him profiting from this in any way, shape or form," Mulvaney said.
Trump has touted his resort, saying it's close to the airport, has plenty of hotel rooms and offers separate buildings for every delegation.
When the United States has hosted the summit before, it has been held in Puerto Rico; Williamsburg, Virginia; Houston; Denver; Sea Island, Georgia; and Camp David, the presidential retreat in Maryland.
The Associated Press contributed to this report.