Kimberly Guilfoyle -- Donald Trump Jr.'s girlfriend and top Trump campaign official -- tests positive for coronavirus - CNN

Donald Trump Jr was tested negative, but as a precaution is also self isolating and is canceling all public events."

Guilfoyle tested positive in South Dakota before she was set to attend the President's event at Mount Rushmore, a person familiar with the matter and a campaign source familiar with the matter said.

Guilfoyle was not with the President and Donald Trump Jr.

That source said Guilfoyle had not had recent contact with the President, but she was in Tulsa, Oklahoma, and was backstage for his rally there and, was also at his event in Phoenix.

Guilfoyle's positive test was first reported by The New York Times.

A former Fox News personality, Guilfoyle assumed the role earlier this year of national chairwoman of the Trump Victory Finance Committee, where she is credited with expanding its ranks of fundraisers.

Guilfoyle and Trump Jr.

had been in the upper Plains region hosting high-dollar fundraisers for several days, people familiar with the matter said.

Guilfoyle has "been with a lot of the campaign donors" in recent days, one source familiar with the matter said.

Billed as a "Mountain West Ranch Retreat," one event occurred in Gallatin Gateway, Montana, from Tuesday until Thursday, according to one of the people.

Another event was billed as the "Rapid City Roundup Retreat" in Rapid City, South Dakota, from Thursday to Friday.

The people said Guilfoyle was not seen wearing a mask during the events.

She is not the first person close to the President to test positive for the virus.