Unless the player is an absolute maniac, he is on a range of QQ+ and possibly AK although I was in a SNG today where the action went (on the very first hand): UTG min raise, UTG+1 call, LJ min raise to 4 BBs, HJ call, CU call and I was on the button with AQs and made the call (pot odds) which let SB and BB also call. UTG then raises to 20, UTG+1 folds, LJ shoves for 100 BBs, HJ calls and it folds back around to UTG who calls. The hands= UTG: JJ, LJ: AKo, HJ: AKo. I was honestly expecting to see an AA or KK from one of the players or AA v KK.
Great lesson. Ranges are super important.