The leader was demoted. I want to send a letter of condolence. What should I send?

No need to send it. Demotion is not promotion. No sympathy. Because he is your superior, not your subordinate. You can't sympathize. If you must send it, send a usual condolence message. I don't know where you are. I am from Zhengzhou. It happened that it rained here today. I sent him a message: (The weather and temperature have dropped in recent days, with light to heavy rain. Remember to bring rain gear when you go out. Take care of yourself! Don't catch cold. After the rain clears, you will see a rainbow. ) The last sentence is condolence in disguise. That's what it means. You can refer to it You can't send it on purpose, or the leader will have other ideas, thinking that you are happy because he was demoted.