I have noticed a certain Fox newsman do this as well. Not sure about him.
However, everyone used to tell me that I was a nut. That was the symbol for Texas sport fans of some sort or another. Then I showed them this page. Tell me that the King of Jordan ever heard of the Texas college football team you ostrich.
There are other symbols that they make with their hands when being interviewed or giving speaches. Do you know what they are?