In this situation I most likely call, because you said it was K,K,x, say it were K,K,J most likely he doesn't not have the boat, and most likely he does not have a King, so you are most likely good here, he might have A-J or Jack whatever, but If I were him and I paired my Jack I would definitely be reraising your $3 pot bet, only I don't minraise, I'd go to $9, and if I were in your shoes I'd contemplate reraising, but most likely I'd call, just in case you did have the boat or a King, but also because you might fold the Jacks to my raise.

You should call his minraise