Interviews aimed for a website redesign

When conducting user interviews for a existing website redesign, do you ask them questions regarding their pain points of using the current site or do ask questions regarding the sector itself? So for example, if the site was a charity, would you focus on the difficulties of using the site and donating using their system or would you focus on the thoughts and feelings of donating on a charity website generally? Or would you approach the interview using both specific and general questions? Thanks.