No 10 refuses to comment on PM's views of racial IQ

Move comes after hiring of new adviser who said black people have lower average IQs

Boris Johnson's spokesman has refused to say whether the prime minister thinks black people have lower IQs on average, or agrees with eugenics, after No 10 hired an adviser with highly controversial views.

In a tense briefing with the media, the prime minister's deputy official spokesman declined several times to distance Johnson from the views of his adviser, Andrew Sabisky, who has suggested "enforced contraception" be used to prevent the creation of a "permanent underclass".