Chucky,
First of all, we need to clarify if the chip count pertains to a wager. If it does not, I don't believe any player can ask for a chip count of any player's un-bet chips
As far as I know, as long as chips are in clear view of all players, the owner of those chips does not have to divulge any information. We see it on a regular basis when a player asks another "How much do you have"? Usually you get an honest answer. However, he does not have to tell you. This is when the responsibility falls on the calling player. My advice, wait your turn and ask the dealer to stack the opponents chips so you can determine exactly what bet amount you are facing...or, how much he can raise you.