GREENWOOD, Ind. -- A central Indiana school district is pushing for the dismissal of a lawsuit that looks to prevent prayer at high school graduation.

In papers filed in federal court, attorneys for the Greenwood Community School Corporation ask that the case be thrown out, and that the student behind the challenge pay the district's legal fees and expenses, 6News' Rafael Sanchez reported.

Eric Workman, 18, a top-ranked senior at Greenwood High School, and the American Civil Liberties Union of Indiana have asked a federal judge to stop a student-led prayer that the senior class voted to approve, claiming the prayer and class vote unconstitutionally subjects students to religious practice.

The school district said in court documents that the students voluntarily choose whether or not to have a prayer, and that no one is being forced to be involved in a religious exercise.

Principal James Kaylor said that in the past, students were told that prayers had to be non-sectarian or non-denominational, but he said that's no longer the current practice.

He said the school does not censor or edit the text of prayers, but that officials check for grammar and to make sure it does not run longer than four minutes.

Kaylor said that the school has no objection to placing a disclaimer in the program advising the audience that "the student remarks are the personal private expressions of students and do not indicate the views or positions of the school or any other graduate or person."

A court hearing on the matter is scheduled for April 30. Greenwood's graduation is set for May 28.

The U.S. Supreme Court ruled in 1992 that clergy-led prayers at public school graduations were unconstitutional.