Katharine Birbalsingh, the government's social mobility tsar, said she believes Boris Johnson is not a good role model for children.
The chair of the social mobility commission told Sky News' Beth Rigby Interviews that the Prime Minister's personal life among other things cause her to have the belief that he is "not professional enough for me".
Birbalsingh, who set up the Michaela Community School in Brent and has been branded as Britain’s strictest headteacher, is a regular speaker at Conservative party conferences.
She spoke about a range of topics, but said while she didn't know the full details of the Partygate scandal, it did make her think "I certainly would never be able to put him up and say, be like him".
When Rigby posed the question if she believed the Prime Minister was a good role model, Birbalsingh said: "No, I don't think so, I wish he could be, but he isn't and that is a bit sad.
"I like Boris, I don't think he’s a bad guy you know, but I don’t know enough about what he’s got up to, but I do not think that he is a good role model for children."
When pushed on why she believed this, she said: "His personal life, for instance, that does make me raise an eyebrow. The other day I saw a picture of him in the metro and I looked at his hair and I thought, oh my goodness, we expect our children to have professional-looking hair.
"Now, you might think that's a bit pedantic and that's a bit silly, but it isn't actually. It's important to look professional and sometimes Boris looks professional, but sometimes he's not professional enough for me. Put it that way."
Johnson is three-times married and, when asked about family values, Birbalsingh said: "It's the sort of thing that makes me pause a little bit now.
"I'd say I'm relatively liberal about these things to a certain extent, you know, but he does kind of push the boat out a bit on that."
The PM was the first ever handed a fixed penalty notice for breaking the law, over a Downing Street lockdown birthday party he attended for nine minutes in June 2020.
Birbalsingh added: "I don't know the ins and outs enough about all the recent Partygate stuff. I just don't know the details because I'm too busy working to follow all of that, but it does sort of make you pause. I certainly would never be able to put him up and say, be like him. I couldn't do that."
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