Brown University is mounting a challenge to the sale of Care New England to Boston-based Partners HealthCare. In a campus letter, Brown President Christina Paxson says the sale to Partners is not in the best interest of Rhode Island and not in the best interest of Brown and its medical school. Partners is closely aligned with Harvard Medical School. Brown is partnering with Prospect Medical of California in an effort to buy financially-struggling Care New England. Prospect is already in Rhode Island, operating Roger Williams Medical Center and Fatima Hospital.