He said parents can have their children opt out of the assembly.

In a letter dated Monday, the ACLU's Miller warned Hansen that making the assembly optional does not make it constitutional.

"The U.S. Supreme Court has been absolutely clear on this point: Religious proselytizing or religious activities have no place in the school, whether or not it's voluntary."

The letter asks the superintendent to consult with the district's insurance representatives and legal counsel. The ACLU "has prioritized protecting the rights of students from this blatant violation of the First Amendment," she said.

Keith Becker said the ACLU's accusations are "unfortunate" and based on misinformation.

"There's a big difference from what we do during the day from what we do at night," he said.

During the evening presentation, the group delivers a gospel message and "encourages students to follow Jesus Christ in every aspect of their lives," Becker said.

During the school day, the program mentions one scripture but doesn't promote Christianity.

"We would not be able to go to 175 schools if we crossed those lines," Becker said.