Learn English – Idiom for a person who is above any question

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I read somewhere a sentence which said about a political leader that he is the "holy something" whose actions cannot be questioned.

The context was to describe that even though this man does bad things, due to his power people are afraid to question his actions. I can not remember the correct idiom, so please help. If you know any similar idiom that can be used in such a context, that would also be great.

Best Answer

is considered beyond reproach

beyond reproach Blameless, faultless, as in Jean's conduct at school is beyond reproach. The phrase employs the verb to reproach in the sense of "censure or rebuke," a usage dating from the early 1500s.
The American Heritage® Dictionary of Idioms by Christine Ammer


reproach — [...] reprochen "to rebuke, reproach," from Anglo-French repruchier, Old French reprochier "upbraid, blame, accuse, speak ill of," [...]
etymonline.com

EDIT: Originally this answer was simply beyond reproach though, as commenters said, this implies subject is in fact perfect, hence added the prefix "is considered" as suggested by @jasper