COLUMBIA, Tenn. (AP) - Columbia State Community College officials say they're investigating a professor's assignment about gay rights.

According to The Daily Herald a Christian legal group sent the college a letter about Professor Linda Brunton's psychology class assignment. The Alliance Defending Freedom said students complained to the group.

Some students objected to being told to wear a rainbow ribbon and make statements in support of gay rights. They were then to write a paper detailing discrimination they faced for their perceived support.

The legal group asked the college to investigate the assignment, discipline Brunton and order her to apologize to students.

Chris Sanders of the Tennessee Equality Project told The Tennessean the assignment was voluntary and is commonly used in psychology classes.

Brunton was unavailable for comment.