On Monday, staffers were advised in a memo they would be required to wear a face covering when entering the West Wing, a person familiar said. The memo said face coverings would be available in the White House medical office and told staffers to follow social distancing guidelines.

Previously, masks were an uncommon sight at the White House, despite guidelines from the US Centers for Disease Control and Prevention recommending them.

…Trump’s top aides were repeatedly tested throughout the weekend and a trip to Camp David was called off in part because of concerns about coronavirus. …A slew of officials, including the President, were at Camp David the weekend before with Miller.

White House scrambles after staffers test positive as new mask mandate takes effect – CNNPolitics

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