Who can fold AK here?

[Soh]

Hi all,

PartyPoker multi-table tournament. First round. The blinds are 10-15.

I have AK in early position. I open-raised 75 with AK (suite doesn't matter.) The guy next to me cold-called. Heads up.

The flop came AT2r. I bet 150. The next guy raised 300. I just called. The turn came 6. I checked. He bet all-in for about 600. I also had about 600. Do you call or fold?

Thank you

Soh