New calls for No10 to sack 'weirdo' advisor Andrew Sabisky, 27, who claimed black people are mentally inferior and advocated forcing 'underclass' to use contraception to boost society's overall IQs

And in another post being circulated on social media, Mr Sabisky claimed black people had lower IQs than white people.

In the article, entitled 'Disabilities by race' he said: 'If the mean black American IQ is (best estimate based on a century's worth of data) around 85, as compared to a mean white American IQ of 100, then if IQ is normally distributed, you will see a far greater percentage of blacks than whites in the range of IQs 75 or below, at which point we are close to the typical boundary for mild mental retardation.'

He added that this was the reason there was a higher rate of black students with an 'intellectual disability'.

His position at the heart of government has sparked such fury in Westminster that ministers are prepared to boycott meetings with Mr Sabisky and stonewall all communication.

They will also demand the Prime Minister overrules his top aide and sacks Mr Sabisky - setting the stage Mr Cummings's first major slap down since he began ruling the roost in Downing Street.

[link to www.dailymail.co.uk (secure)]