I am concerned about the safety of all my students in my in-person class. If a student shows up to my in-person class unmasked, what do I do?

I am concerned about the safety of all my students in my in-person class. If a student shows up to my in-person class unmasked, what do I do? If I ask the unmasked student to put on a mask and they refuse, can I have them disenrolled from the course? Can I ask them to leave the room?