Guilfoyle was not with the President and Donald Trump Jr. has so far tested negative, the person familiar with the matter said. 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 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.

Experts say wearing a mask or other face covering could reduce the transmission of Covid-19 by as much as 50%.

Earlier this week, Trump Jr. posted an image on Facebook of a lab where scientists were working in certain hazmat suits known as positive pressure suits. Text on the image says, “This is what virologist wear to protect themselves from a virus. Don’t worry, though. Your bandana probably works too.”

The image is from 2017 and was taken at the Wuhan Institute of Virology in Wuhan in central China’s Hubei province.

In posting the image, Trump Jr. wrote, “Solid point.” The post has received more than 40,000 shares and over 69,000 reactions on Facebook.

This story has been updated with additional details.