Martin Luther King III supports school options and spoke at a Florida rally Tuesday, the day after the national holiday dedicated to his father.

“This is about justice; this is about righteousness,” King said in Tallahassee, Fla. “This is about freedom — the freedom to choose for your family and your child.” The rally called on the Florida Education Association, the state’s largest teachers’ union, to drop a lawsuit challenging a school choice program, as reported by the Miami Herald. The lawsuit challenges the constitutionality of a state tax credit for businesses that donate to nonprofit groups that give scholarships to low-income students.