"I do not believe we have to choose between law and order and racial justice in America."

Miller's wife, Katie Miller, who is a spokeswoman for Vice President Mike Pence, tested positive for the virus in May.

Biden slams Trump over his mask-less appearance.

"Which staff members can speak to anonymously, specifically to focus on mental health concerns."

The move is the latest effort by U.S. officials to play down politics around the vaccine and assure public safety.