Preflop, I like a fold, but calling or capping are close.

Flop call is good.

Turn play is ultra-debatable. Donker may have a mid-pair or any of the hands that Dane mentioned. Button however is where the problem is. He doesn't have to have AQ or AJ like others say (at least not when it's your action on the turn), and I don't see those as a super easy hands for him to have although they are in his range. He could very easily have AT, KK, 99 or 88 as well.

Once you make the turn raise and "get away with it", it becomes fairly obvious that CO had nothing great and button has AQ, AJ or AT....now with a less likely chance of 99 and 88. Discounting 99 and 88 and considering a call from the ace high hands should get us get us right around neutral EV on a river bet.

EDIT: I wouldn't be surprised seeing QQ or JJ from the button either.