The invalidation of the imam's ablution during the tashahhud and appointing someone else in his place

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: An imam's ablution was invalidated during the first sitting of tashahhud or during the final sitting. How should he leave and appoint someone else? Does this invalidate the prayer of the ma'mum (those praying behind him)?

Answer:
There is no appointment in this case. If his ablution is invalidated before he appoints someone, he leaves, performs wudu' (ablution), returns, and prays with them anew, starting the prayer from the beginning. And if he appoints someone to start the prayer with them anew, there is no harm.