Ronna McDaniel, the chairwoman of the Republican National Committee, has tested positive for the coronavirus and is experiencing mild symptoms, according to several people briefed on the situation.
Ms. McDaniel is the latest person who is in frequent contact with President Trump to test positive for the virus.
She was last with Mr. Trump last Friday, and has been at her home in Michigan since then, the people briefed on the matter said.
She received her diagnosis on Wednesday, they said. After a crowded donor event in March at Mar-a-Lago, the president’s private club in Florida, Ms. McDaniel fell ill, but she tested negative at the time.