Hicks travels regularly with the president on Air Force One and, along with other senior aides, accompanied him to Ohio for the presidential debate on Tuesday and to Minnesota for a campaign event on Wednesday.
Trump has come under sharp criticism for his response to the coronavirus pandemic, which has killed more than 200,000 people in the United States alone. The president has touted his management of the crisis.
He and his staff regularly do not wear masks, and Trump has denigrated people who wear them regularly. Health professionals say mask-wearing is one of the key things people can do to help prevent the spread of the virus.
Trump and his aides regularly get tested for the virus. But testing does not make someone immune.
At the White House, people who are around Trump, including some reporters, get tested on a regular basis. But the White House did away with regular temperature checks for everyone who enters the complex months ago, and people who are tested for the virus interact with others on the White House campus who are not.
Vice President Mike Pence’s spokeswoman, Katie Miller, tested positive for the virus earlier this year and suffered from symptoms before recovering.