Bob Schieffer sat down and interviewed British Prime Minister David Cameron on Sunday's Face the Nation to discuss the recent Paris terror attacks by radical Muslims. At one point in the discussion, Schieffer asked Cameron about the "special nick-name" Obama sometimes used to address the prime minister: "bro."

Schieffer: You say he calls you "bro." What do you call him?

Cameron: Well, it’s normally Barack and David but every now and again there’s been some other things thrown around and I suppose "bro" is one of them. But I took that in good heart.

Schieffer: But, I mean, you don’t have a special nick-name for him?

Cameron: I don’t, no. I mean, if I did, I probably wouldn’t tell you.