Arizona’s superintendent of schools said on Wednesday a controversial ethnic studies program in Tucson public schools violates new state law and he threatened to cut off $15 million in funds for the district, Reuters reports. Schools chief John Huppenthal gave the Tucson Unified School District 60 days to prove that it had followed the law–which forbids promoting resentment of an ethnic group or advocating ethnic solidarity, or programs designed primarily for students of one ethnicity…