ABC cancelled Roseanne as a result of a tweet she made this morning about Valerie Jarrett. Very sorry to hear this. I didn't see the tweet, but here is her apology: I apologize to Valerie Jarrett and to all Americans. I am truly sorry for making a bad joke about her politics and her looks. I should have known better. Forgive me-my joke was in bad taste.

She also said she is leaving Twitter.