GREENWOOD, Ind. -- A central Indiana district isn't calling off a planned high school graduation prayer unless a federal judge orders it.

Greenwood School Board president Joe Farley says the district wants the judge to decide the merits of a lawsuit filed by the school's top-ranked senior.

Greenwood High School student Eric Workman is asking a federal judge to stop a student-led prayer that the senior class voted to approve.

The lawsuit filed by the American Civil Liberties Union of Indiana on the 18-year-old's behalf claims that the prayer and class vote unconstitutionally subject students to religious practice.

The school district has until April 16 to respond to the lawsuit, and a court hearing is scheduled for April 30. The district's attorneys didn't immediately return telephone messages seeking comment Friday.