Downing Street has said its adviser Andrew Sabisky has resigned, following criticism of alleged past remarks on pregnancies, eugenics and race.
Labour had called for Mr Sabisky to go for reportedly saying black people had lower average IQs than white people.
He is also alleged to have said compulsory contraception could prevent "creating a permanent underclass".
Mr Sabisky tweeted: "I wanted to help the government not be a distraction... accordingly I've decided to resign."
"I know this will disappoint a lot of people but I signed up to do real work, not be in the middle of a giant character assassination," it continued.
"If I can't do the work properly there's no point, and I have a lot of other things to do with my life."
What is Mr Sabisky believed to have said?
In a comment on a 2014 blog post on Mr Cummings' website, made by a user called "Andrew Sabisky", it is suggested that compulsory contraception could be used to stop a "permanent underclass".
"One way to get around the problems of unplanned pregnancies creating a permanent underclass would be to legally enforce universal uptake of long-term contraception at the onset of puberty," says the post.
"Vaccination laws give it a precedent, I would argue."
In a comment on another blog post on a different website in 2014, what appears to be the same user suggested black Americans had a lower average IQ than white Americans.
In a comment on a different blog that same year, a user with his name said: "There are excellent reasons to think the very real racial differences in intelligence are significantly - even mostly - genetic in origin, though the degree is of course a very serious subject of scholarly debate."
Mr Sabisky also suggested to Schools Week in July 2016 that the benefits of a purported cognitive enhancer, which can prove fatal, are "probably worth a dead kid once a year".
"Eugenics are about selecting 'for' good things," he said in the same interview. "Intelligence is largely inherited and it correlates with better outcomes: physical health, income, lower mental illness.
And in a Twitter post from 2019 , he said: "I am always straight up in saying that women's sport is more comparable to the Paralympics than it is to men's."
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Apparently he was an incel-esque agony aunt on reddit.
In one post, from seven years ago, a man explained that his Mormon wife was reluctant to have sex with him and asked for advice.
Under the username thedovelamenting, Sabisky responded by urging him to try to "rewire" her brain "to the point where she no longer, consciously or subconsciously sees a conflict between a good Christian woman and serving you up 39 flavours of slut on command".
He added: "It ought to be obvious that her wifely duty ought to consist not just of letting you masturbate into her vagina but actively playing her part in building a fantastic sex life with you.
"Yes, that might require pushing through some initial mental discomfort but it is simply selfish and unchristian of her not to make the effort."
Sabisky then urged the man to "take the lead a little bit more".
He said: "Theologically speaking she is your wife and should submit to you as unto the Lord, so if you want doggy then it is your place to command her to get on her hands and knees and her place to obey."
He added: "If you want a blow job you should get one because she is your wife and lover … She's just being selfish really (which isn't very Christian)."
In another post, he recommended that a 26-year-old man looking to lose his virginity pay "lots of money for a really good hooker".
When a woman posted about finding "disturbing porn" on her boyfriend's computer, including erotic fiction about incest, paedophilia and rape, Sabisky told her he didn't "see all that much to worry about here".
REVEALED: PM's new aide made vile claims about women and sex on Reddit
THE Prime Minister’s newest adviser once claimed it was a woman’s Christian “duty” to have sex with her husband, The National can reveal.
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