As an instructor, you do not impose sanctions under the Code
and therefore you are not required to allow the student to bring an Ombudsperson or other advisor. However, when a student brings an Ombudsperson, there are a number of benefits both to the student and to you. An Ombudsperson can help the student prepare for the meeting beforehand and provide support during the meeting. The Ombuds can also offer information on policy and process, and provide some consistency between the meeting with you and any subsequent discipline meetings the student may face.
For your own benefit, it can also be helpful for you to invite a colleague or administrator from your department to sit in as a witness or to take notes while you concentrate on the conversation.
If you do have others in the meeting, remember that you and the student are the two main participants in the discussion.