"Quite simply, the position Fox has taken on our government's policy of separating children from their parents is too heinous for me to accept," Turkel wrote in an open letter to Fox News.
Turkel, an author and branding expert who has appeared on a number of networks over the years, singled out Fox hosts Ann Coulter and Sean Hannity for remarks on the children affected by President Donald Trump's family-separation policy.
Coulter claimed children seen crying in videos at detention centers were merely "child actors" who were given scripts. Hannity, according to Turkel's letter, said they were part of a "rolling invasion." Another Fox contributor said the children were better off alone in the centers' cages than with their parents. Laura Ingraham downplayed the detention center cages as "summer camps" or "boarding schools."
"Accepting that this misguided policy is wrong doesn't depend on which side of the political aisle you're on. It doesn't matter if you support immigration and immigrants or if you don't," Turkel wrote. "Separating innocent children from their parents and jailing them is just plain wrong."
A Fox News spokesperson declined to comment on Turkel's letter.
Turkel's appearances on Fox were unpaid. He said in his letter that his relationship with the network generated speaking fees, book sales and appearances on other TV networks.
Turkel said he's disagreed with Fox News coverage of other issues, and this isn't the first time he's "suffered a sleepless night wondering how I could continue to appear on your shows."
What's different now, he said, is his belief that there is no gray area in the Trump policy being supported by Fox.
"Separating children from their parents is wrong no matter who you are," he concluded. "I quit."