Fox said Thursday that the post was removed because of the reference. It had been posted Wednesday.
Coulter wrote about how MSNBC's Martin Bashir suggested Republican senators wouldn't support stronger gun control legislation until a member of their family was killed. She wrote: "Let's start with Meghan McCain!"
McCain tweeted on Thursday that she "couldn't imagine living a life that seems so void of love, compassion and perspective."
Her mother, Cindy McCain, tweeted that "Ann Coulter needs to get a life!"