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.
