A prosecutor who was leading the case of Kim Potter, the former Brooklyn Center officer accused of manslaughter in the death of Daunte Wright, resigned on Monday after he said the office had been infused with “partisan politics.”

Imran Ali, who served in the Washington County Attorney’s Office in Minnesota for 10 years, tendered his resignation via a letter to his boss, County Attorney Pete Orput. The former prosecutor said that “it has been an honor” to serve the citizens of his area, though “vitriol” and “extreme partisan platforms” drove him to make his decision.