ABC canceled its top-rated show Tuesday after Barr described former Obama administration adviser Jarrett, an African-American, as the offspring of the Muslim Brotherhood and "Planet of the Apes".
Some subtly told Trump what they thought of his tweet.
Sanders also said Iger owes Christians an apology for failing to take action after ABC host Joy Behar called a tenet of Vice President Mike Pence's evangelical Christianity "mental illness".
"Where was Bob Iger's apology to the White House staff for Jemele Hill calling the president and anyone associated with him a "white supremacist".More news: NFL Players Considering Sitting out Season Until Colin Kaepernick is Signed
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Iger stepped down from a Trump advisory panel previous year, following the president's decision to exit the Paris accord on climate change.
Barr, on Twitter, apologized Tuesday for her tweet about Jarrett, which was met with widespread condemnation - including from Barr's own co-stars.
"We're so sorry they were swept up in all of this and we give thanks to their remarkable talents, wish them well and hope to find another way to work together down the road", wrote Sherwood in an email titled "Our Values". "No one is defending her comments - they're inappropriate - but that's the point he was making".
The pharmaceutical company that makes Ambien has said "racism is not a known side effect" in response to Roseanne Barr blaming the drug for an offensive tweet. "I am disappointed in her actions to say the least".
Sanders also said she was not aware of the president having any conversations with Barr, who is a Trump supporter, following the actress's controversial tweet. - I just want to apologise to the hundreds of people, and wonderful writers (all liberal) and talented actors who lost their jobs on my show due to my stupid tweet.
"We didn't know what was going to happen", Mr. Rasmussen said of her Twitter account. "I will examine all of my options carefully and get back to U".
Barr's TV show was a new version of her 1988-97 sitcom "Roseanne". It was praised for its realistic portrayal of working-class life.