The grandson of John F Kennedy publicly demanded that Megyn Kelly show him her genitals in his latest unhinged outburst.

Jack Schlossberg, 32, commented on an Instagram post from Kelly's show on the Israel - Iran conflict, which montaged Israeli Prime Minister Benjamin Netanyahu claiming Iran is close to building a nuclear bomb over several decades.

In a comment on the video, Schlossberg wrote: 'Looking extremely feminine!! Very good. Now show us your c@&6.'

Schlossberg, whose late grandmother Jaqueline Kennedy Onassis is regarded as one of the most dignified female celebrities of all time, appeared to delete the comment soon after.

Kelly's show did not immediately respond to request for comment.