ABC has canceled its hit show “Roseanne,” after its star, Roseanne Barr, fired off a series of racist comments on Twitter. In one tweet, Roseanne wrote, “muslim brotherhood & planet of the apes had a baby=vj.” It was a reference to Valerie Jarrett, longtime adviser to President Obama, who’s African-American. Roseanne also accused billionaire George Soros, who’s Jewish, of being a Nazi collaborator, and attacked Chelsea Clinton. The decision to cancel “Roseanne” was made by Channing Dungey, the first African-American president of a major TV network. The reboot of the hit 1980s sitcom “Roseanne” last year drew huge audiences and praise from President Trump, who once called Roseanne Barr to congratulate her on the show’s success.