It started with a tweet from Roseanne Barr about ex-Obama advisor Valerie Jarrett. Jarrett was born in Iran to a black father and white mother. Barr tweeted what she claimed was a joke, comparing Jarrett to an ape and connecting her to the Muslim Brotherhood:
"Muslim brotherhood & planet of the apes had a baby=VJ”
Within an hour, Wanda Sykes announced that she was leaving the show as Consulting Producer. Sara Gilbert tweeted her displeasure. A few hours later, ABC announced the show has been cancelled.
https://www.theguardian.com/culture/2018/may/29/roseanne-barr-tweet-valerie-jarrett-ape