[shpanko]

People have been pushing AK pf if they choose to 4-bet with it. Once he raises to 56 he isn't folding so your decision needs to be made pf. He's a TAG and raised from UTG+1, if you are TAGgy at all he knows you are strong when you reraise this kind of raise from him yet he still rereraises to 56.

The small 4-bets are always AA so I think you are beat here. If he's decent and you haven't been picking on him or playing like a maniac then this should definitely be a fold because he doesn't 4-bet JJ/QQ. It's either AK which you flip with or AA/KK which have you crushed. I think this is a fold.