Erick Tsang Kwok-wai has resigned as Hong Kong’s constitutional and mainland affairs chief, saying that he has elevated prostate cancer markers in his blood and cannot cope with the heavy workload. State news agency Xinhua first reported the State Council’s decision to remove Tsang from his post on Tuesday morning, ending days of speculation over the 62-year-old’s departure from the cabinet. Meeting the press later with Tsang, Chief Executive John Lee Ka-chiu said he had decided to recommend the...