chances are he probably is looking at top pair of kings probably with a slightly worse kicker maybe hes sitting KJ. If you re raise in this situation hes going to either fold his bluff, call you asking to see a turn indicating he is either on a draw or doesnt have KQ, or shove. If he makes the shove just get out of their. If he simply calls and say a not draw heavy card hits then u can make a large re raise to attempt to take the pot or check the turn and let him bet into you. So your best option seems like a re raise to me in this situation