“Do you really think that any celebrity or politician goes on a talk show without knowing the agenda in advance?”
Donald Trump puts himself out there to be grilled by Sean Hannity three or four times a week and there has never been any indication that Sean informs Trump about the questions prior to their being asked.
I'm not referring to a news show.
I'm referring to talk shows like Oprah, Ellen, the Tonight Show, Conan, etc.
Their guests are almost always there to promote themselves, or a movie or TV show. It's not a serious show, and you shouldn't expect serious questions or serious answers.