Chicago ? A 14-year-old girl and her outspoken atheist father filed a federal lawsuit Friday challenging a new Illinois law requiring a brief period of prayer or reflective silence at the start of every school day.

The lawsuit asks the court to declare the law unconstitutional, said attorney Gregory Kulis, who represents Dawn Sherman, a freshman at Buffalo Grove High School, and her father, Robert Sherman, a radio talk show host.

Kulis said the law is an attempt to inject religion into public schools in violation of the First Amendment. The suit also seeks a temporary restraining order to halt schools’ obeying the law until the case is decided. A judge will consider that request at a hearing Monday.

The lawsuit names Gov. Rod Blagojevich and officials of Township High School District 214 as defendants. School district spokeswoman Venetia Miles said schools will continue to comply with the law.