As Xi Looks to Extend His Rule, He Leans on a Longtime Ally

As China’s leader, Xi Jinping, forges toward a fourth term in power, he confronts a dilemma common to aging autocrats: testing and recruiting a rising generation of loyal officials while ensuring his own dominance. To manage this looming challenge, he is leaning on Cai Qi, a longtime deputy who is probably the most influential official in Mr. Xi’s inner circle. Tall, silver-haired, and constantly at Mr. Xi’s side, Mr. Cai is a supercharged chief of staff to his leader. Mr. Cai holds multiple leading roles, including in national security and…