The investigator found no violations at the time of the visit, but the agency pledged to continue monitoring the hotel.

District Mayor Muriel Bowser, a Democrat, this spring ordered people to cover their faces while in the lobbies and common areas of hotels and to maintain six feet of distance from others, in an effort to limit the spread of the novel coronavirus.

ABC News reported Tuesday that guests at Trump properties have repeatedly flouted face-covering mandates. A Facebook invitation for a birthday party scheduled for Saturday at the District hotel featured a "NO MASKS ALLOWED" disclaimer, the network reported. The invitation did not appear to be visible on the social media site Wednesday.

An inspector from the District Alcoholic Beverage Regulation Administration, which fines businesses with liquor licenses that don't comply with city regulations, visited the hotel on Wednesday afternoon. Inspectors can only issue fines or warnings for violations that they see in person, and all hotel staff members and visitors during the inspection were wearing masks, ABRA said.

Representatives of the hotel and the Trump Organization did not immediately return requests for comment.