Just because a reporter tells you the focus of an interview beforehand, does not mean she is obliged to stick only to that focus.
When I was working on my investigation of nursing homes I told the administrator of one derelict home that my focus was to heighten awareness of what life is like in a nursing home, in terms of accommodation, food, physiotherapy etc. To ensure I kept to my word I asked questions on those subjects for the first ten minutes of the interview. Then, when the administrator's guard was down, I hit her with questions about abusive staff, stolen property, lousy food, bedbugs and so on. At least she couldn't say I misled her.