At the request of a party the court may order witnesses excluded so that they cannot hear the testimony of other witnesses, and it may make the order of its own motion. This rule does not authorize exclusion of (1) a party who is a natural person, or (2) an officer or employee of a party which is not a natural person designated as its representative by its attorney, or (3) a person whose presence is shown by a party to be reasonably necessary to the presentation of the party's cause.

[Amended effective September 1, 1992.] Comment 615 [Deleted effective September 1, 2006.]