“The system is broken,” Prince told the audience, according to the Sun. “It’s going to take the young people to fix it this time. We need new ideas, new life.”

While Mosby did not speak to the audience during the concert, her appearance comes just two days after the cops in the case filed motions of dismissal and recusal. The officers claim that Mosby has several personal, political and professional conflicts of interest and that she should remove herself from the case and allow a special prosecutor to take over.

According to the Sun, Mosby’s husband gave her the tickets for the concert as a Mother’s Day gift.

Even before appearing on stage with Prince Sunday, Mosby has been accused of making statements that were seen as prejudiced against the criminal justice system.