text:  Hello, I'm Justine Green with the BBC News. Vietnam's President Tho Lam appears to be solidifying his power after being appointed as caretaker leader of the governing Communist Party. He's taking over from the General Secretary Nguyen Pho Truong, who's been the most powerful man in the one-party state for more than a decade. He's receiving treatment for an unspecified illness. Tung Le of the BBC's Vietnamese service has this report.