SINGAPORE—Singapore’s prime minister, Lee Hsien Loong, promoted several junior ministers Tuesday, including one who is seen as a possible successor.
The changes come amid speculation over who will replace the 66-year-old Mr. Lee, who has indicated he plans to step down in the coming years. He has served as premier since 2004, and his People’s Action Party has governed since independence in 1965. The party is expected to run the government for the foreseeable future, allowing it effectively to choose future leaders years in...