I think it's just the reflection of the studio lights unless.....he has a camera in his eye socket and he's a super soldier like Duncan O.
Why he's wearing a hat, indoors and during an interview is a little strange though. I take it he has a receding hairline and is self conscious but
By the way, Ventura denies this.
Oh, and OP?......why are you watching FOX news much less, O'Reilly anyway? Hasn't ATS taught you anything